Index to the US Patent Classification

Index to the US Patent Classification

What follows is part of the Index to the US Manual of Classifications for patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retreive patent titles by entering the class/subclass in the box below.


Enter a class/subclass code here to get a list of patent titles. Use any of the following forms:
363-131 121-55A 14-.5
that is, no embedded spaces, class and subclass seperated by a dash, and any subclass letters capitalized. Currently Design Patent titles (those in the classes of the form Dxx.yy) are not retreivable.

Enter class/subclass code:


HOOD
  ACTUATED BY TOOL OR WORK APPROACH .29/DIG.59
  AUTOMOBILE ........................180/69.2+
     COMBUSTION AIR VENTS ...........180/68.1+
     DESIGN .........................D12/173
     HINGE ..........................16/355+
     LOCK ...........................70/240+
  CONVEYOR DISCHARGE ................198/637
  CURTAIN SHADE OR SCREEN COMBINED ..160/19+
  DESIGN (SEE HEADWEAR) .............D02/865+
  ENCASED CUTTER ....................29/DIG.86
  EYE SHIELDS .......................2/10+
  FIREPLACE .........................126/550
  FLASH POWDER LIGHT ................431/364
  FLUORESCENT AND PHOSPHORESCENT
     DEVICES ........................250/492.1
  FOCUSING CAMERA ...................354/287
  GARMENT COMBINED ..................2/84
  HEAD COVERING .....................2/202+
  METAL WORKING WITH SHIELD OR HOOD
     MOVEMENTS ......................29/DIG.56
  PROGRESSIVE DISPLACEMENT OF .......29/DIG.6
  STOVE .............................126/299.R+
     DESIGN .........................D23/371+
  TELEPHONE .........................379/453
  VENTILATING .......................454/49+
  WOODWORKING CUTTER ................144/252.R


HOOF
  CALKS .............................168/29+
     SHARPENING TOOLS ...............168/46
  CLEANERS AND TRIMMERS .............168/48.1+
  EXPANDER ..........................168/47
  FARRIERY ..........................168
  GAUGE .............................33/195
  HOOF CRACK REMEDY .................606/212
  PADS ..............................168/26+
     DESIGN .........................D30/149+
  SHOES .............................168/4+
     DESIGN .........................D30/147+


HOOK (SEE ALSO CONNECTION) .......... 24/698.1+
  ATTACHING
     BELT HOOK INSERTING ............29/243.51
     LACING .........................227/51+
     SEWING MACHINE .................112/105+
  BICYCLE CARRIER ...................224/42
  BOLTS HOOKED END ..................292/95+
  CANT HOOK HAND BAR ................294/17
  CARPET FASTENER ...................16/6
  CARRIER BY HAND ...................294/137+
  CHATELAINE SAFETY .................24/4
  CLASP COMBINED ....................24/343+
     CUFF HOLDER ....................24/45
  CURTAIN HOOK ......................D08/367+
  CUTTER COMBINED ...................7/161+
  DESIGN ............................D08/367+
     APPAREL ........................D11/208+
     CURTAIN ........................D08/367+
  DRAFT COUPLINGS
     ANIMAL .........................278
     RAILWAY ........................213/78+
  EYE AND ...........................24/698.1+
     DESIGN .........................D11/208+
     RELATIVELY MOVABLE HOOK PORTIONS
       PORTIONS .....................24/598.7+
  FISH ..............................43/43.16+
     DESIGN .........................D22/144
     GAFF COMBINED WITH TACKLE ......43/5
     MAKING .........................29/9
     TRAP HOOK ......................43/34+
     WITH ARTIFICIAL BAIT ...........43/42+
  HAND ..............................294/26
  HARDWARE, EYE & ...................D08/367+
  HARNESS
     CHECKHOOKS .....................54/61+
     CHECKREIN LOOP .................54/17
     DESIGN .........................D30/138+
     TRACES .........................54/55
  HAT FASTENER ROTARY ...............132/62
  HOIST LINE ........................294/82.1+
  KNITTING ..........................66/3+
  LACING FASTENING ..................24/713.9
  LACING STUD .......................24/713.9+
  LADDER EXTENSIBLE STOP ............182/209+
  LADDER SUSPENSION .................182/206
  LOG TURNER ........................83/710+
     CHAIN COMBINED .................83/710+
  MAKING
     FISH ...........................29/9
     METAL ..........................29/7
     WIRE ...........................140/80+
  NAPKIN ............................24/8
  NECKTIE ...........................24/65
  OBSTETRIC TRACTOR .................606/121
  PELICAN ...........................294/82.24+
  PICTURE OR MIRROR SUPPORT .........D08/373+
     HOOK OR EYE ....................D08/367
  PIN COMBINED ......................24/351+
  PIPE JOINT
     DUPLICATE END ..................285/70+
     PIPE TO PLATE ..................285/191
  RAIL FASTENING ....................238/355+
  ROD JOINT SOCKET COMBINED .........403/301
  SASH CORD .........................16/206
  SEPARABLE HINGE ...................16/260
  SNAP ..............................24/598.4+
     TAG LABEL CHECK FASTENER .......40/667
  SUBMARINE .........................294/66.1+
  SUPPORTS
     BAG MOUTH HOLDER ...............248/100
     BRACKET HAVING .................248/290
     BRACKET HAVING .................248/294
     BRACKET HAVING .................248/301
     BRACKET HAVING .................248/303
     BRACKET HAVING .................248/304+
     CLAMPED TO .....................248/227
     FAUCET ENGAGING ................248/213
     HORIZONTAL ROD ENGAGING ........248/215
     LADDER ENGAGING ................248/211
     OVERHEAD BEAM ..................294/85
     PENETRATING ....................248/216.1+
     ROD TO RADIATOR ................248/234
     SUSPENDED ......................248/322
     SUSPENDED ......................248/339+
  TACKLE ............................294/82.11+
  TELEPHONE RECEIVER SWITCH .........379/426+

HOOKAHS ............................. 131/173


HOOP
  BARREL ............................217/91+
  COOPERING
     DRIVERS ........................147/7+
     MACHINES .......................147/43+
     TRUSS ..........................147/49
  EMBROIDERY ........................38/102.2
  MAKING
     METAL ..........................29/7
     WOOD BY BENDING ................144/258
     WOOD BY SAWING .................83/425+
  SAIL ..............................114/113
  SKIRTS ............................2/216
     DESIGN .........................D02/851+
     DESIGN FRAME ...................D02/855
     MAKING .........................223/6
  TOY ...............................446/236+
     ROLLING ........................446/450+


HOPPER (SEE MAGAZINE)
  DISCHARGE
     BOTTOM FORMING CONVEYOR ........198/550.1
       DISCHARGE TO GRAVITY SECTION .198/550.1+
       GRAVITY DISCHARGE HOLDER .....198/540+
     DISPENSER ......................222
  DUMPING LAND VEHICLES .............298/24+
  DUMPING RAILWAY CAR ...............105/247
     FLAT CONVERTIBLE TO ............105/243
  FEEDING AND FEEDER
     ANIMAL .........................119/52.1+
     ANIMAL, DESIGN .................D30/121+
     ARTICLE ........................221
     BAG FILLING ....................53/570+
     CIGARETTE TUBE .................131/74
     FILLER TOBACCO OR BUNCH ........131/44
     FURNACE CHARGING BELL AND ......414/204
     FURNACE FUEL ...................110/108+
     FURNACE FUEL BLOWER ............110/105
     MATCH DIPPING FRAMES ...........144/64
     ROTARY DRYING DRUM EXTERNAL     34/112
       TYPE .........................34/112
     SIFTER .........................209/244+
     STATIC MOLD HAVING .............249/108
     TOBACCO FOR CIGAR ETC MAKING ...131/108+
     TRACK SANDER ...................291/38+
     TRACK SANDER WITH JET IN .......291/18
     TRACK SANDER WITH OSCILLATING ..291/30
     WOOD SLICING ...................144/180
  PLANTING COMBINED
     AUXILIARY FRAME HILL TYPE ......111/24
     DIBBLE WITH REVOLVING ..........111/90+
     FLOATING AUXILIARY FRAME .......111/63+
     REVOLVING ......................111/74
     VIBRATING ......................111/75
  POWER DRIVEN CONVEYOR COMBINED
     BOTTOM FORMING .................198/550.1
     CHUTE AND ......................198/568+
     DISCHARGE FOR ..................198/523+
     FEEDER .........................198/523+
     PLURAL CONVEYORS ...............198/570+

HOPPLES ............................. 119/816+
  SLINGS COMBINED ...................119/816+


HOPS AND HOPPING .................... 426/11+
  APPARATUS .........................99/278+
  PLANTS ............................PLT/100
  STIRRER ...........................366/343+
  VINE STRIPPER .....................460/123+

HORIZON ARTIFICIAL .................. 356/248+

HORMONES ............................ 552/502+
  ANIMAL EXTRACTS
     MEDICINES CONTAINING ...........424/520+
  HETEROCYCLIC ......................540/2+
  SEX ...............................552/502+

HORMONES,PROTEIN .................... 530/399

HORN ................................ D10/120
  ANTENNA ...........................343/786
  EAR TRUMPET .......................181/129+
  ELECTRIC ..........................340/388+
  FERTILIZER ........................71/18
  FOG ...............................116/137.R+
  LAMP COMBINED .....................116/3
  LOUD SPEAKER ......................381/156
  MAKING BY DEFORMING SHEET METAL ...72
  MEGAPHONE .........................181/177+
  MUSICAL INSTRUMENT ................84/387.R+
     DESIGN .........................D17/11
  PERIODIC SOUNDING .................116/24
  PHONOGRAPH ........................369/163
  SHIELD ............................119/851
  SHOE ..............................223/118+
     DESIGN .........................D02/642
  SHOE INSEAM TRIMMER ...............12/4.5
  STRINGED INSTRUMENT RESONATOR .....84/294
  STRUCTURE .........................116/137.R+
  TOY ...............................446/209
  VEHICLE ...........................116/59
     DESIGN .........................D10/120+


HOROLOGY ............................ 368

HOROLOGY ............................ 968*
  ANTIMAGNETIC DEVICES ..............368/293
  BALANCES ..........................368/169+
  CLOCKS ............................368/62+
  DESIGN ............................D10/30+
  DIAL TRAINS .......................368/220+
  DIALS .............................368/232+
  DIALS HANDS .......................368/238+
  ESCAPEMENTS .......................368/124+
  INVERTIBLE, HOUR GLASS TYPE .......368/93
  PARKING METER TYPE ................368/90+
  PENDULUMS .........................368/134+
  SAFETY WHEELS .....................368/181+
  WATCHES ...........................368/62+

HORSE
  BLANKETS ..........................54/79.1
     DESIGN .........................D30/145
  BOOTS .............................54/82
     DESIGN .........................D30/146+
  COLLARS ...........................54/19.1+
     DESIGN .........................D30/137
     HAMES COMBINED .................54/18.1+
     SHAPING ........................69/3
     STUFFING .......................69/4
  CONFINING AND HOUSING DEVICES .....119/15+
  DETACHERS .........................278/21+
  FOUR LEGGED SUPPORT ...............182/181+
     UNITARY FOLDABLE ...............182/153+
  GROOMING AND CURRYING DEVICES .....119/83+
     WITH AIR DRAFT .................15/363+
  GYMNASTIC .........................482/25
  HARNESS ...........................54
  POWERED MOTOR .....................185/15+
     COMPOSITE OR MULTIPLE ..........185/3
  RAKE HORSE DRAWN ..................56/375+
  TRAINING APPARATUS ................54/71


HORSESHOE ........................... D30/147+
  CALK ..............................D30/150
  FARRIERY ..........................168
  MAKING ............................59/36+
  NAIL MAKING
     CUT TYPE .......................470/37
     WROUGHT TYPE ...................470/38
  NAILS .............................411/439+

HORTICULTURE (SEE PLANT HUSBANDRY)
  HORTICULTURAL TOOLS ...............D08/1+
  ILLUMINATION ......................362/805*

HOSE (SEE STOCKING)
  ALARM SYSTEM VIA FLUID HOSE .......340/320
  APPLYING AND REMOVING .............29/235+
  BRIDGE ............................104/275
  BRUSH OR MOP COMBINED .............401/289
  CARRIER REEL ......................242/86+
  CLAMP APPLIER .....................81/9.3
  CLAMPS ............................24/19
     CUTOFF .........................251/4+
  CONNECTIONS .......................285/238+
  DISPENSED MATERIAL GUIDE ..........222/527+
  DISPENSING GUIDE INTERLOCK ........222/74+
  FIRE FIGHTING VEHICLE .............280/4
  HOLDER AND FLUID SUPPLY ...........137/355.16+
     WITH NOZZLE ....................239/195+
  LIQUID LEVEL GAUGE COMBINED .......73/294
  MAKING ............................156/143+
  NOZZLE ............................239/589+
  PANTYHOSE .........................2/409
  PROTECTORS ........................138/110
  STRUCTURE .........................138/177
     DESIGN .........................D23/266
  SUPPORT ...........................248/75+
  SUPPORTERS
     FLUID CONDUIT OR NOZZLE ........248/75+
     PLURAL GARMENT .................2/306
     STRIP CONNECTED SPACED HOLDER ..2/335
     TORSO OR LIMB ENCIRCLING .......2/311+
  WATER HOSE ........................D23/266
  WHEELED HOSE REELS ................242/86.2+


HOSPITAL FURNITURE AND EQUIPMENT
 (SEE TYPE)

HOT AIR FURNACE ..................... 126/99.R

HOT BEARING INDICATOR ............... 116/214
  TRAIN HOTBOX ......................246/169.A

HOT BED ............................. 47/19

HOT BLAST STOVES .................... 432/214+

HOT DOG
  COOKER ............................D07/323+
  PACKAGING .........................53/DIG.1

HOT HOUSES .......................... 47/17+
  ENGINE COOLING VENTS ..............180/68.3

HOT PAD OR MITT ..................... D29/20+

HOT PLATE ........................... 219/443+
  DESIGN ............................D07/362+

HOT TOPPING ......................... 164/122+


HOT TOPS ............................ 249/106

HOT WATER BOTTLE .................... 383/901*
  DESIGN ............................D24/207+

HOT WATER FURNACE ................... 122

HOT WIRE METERS ..................... 324/106

HOUNDS
  VEHICLE ...........................280/139
     DRAFT POLE COMBINED ............278/43

HOUR GLASS .......................... 368/93


HOUSE ............................... 52
  AMUSEMENT .........................472/136
     ILLUSIONARY ....................472/74
  ANIMAL ............................119/15+
  ANNUNCIATORS ......................340/815.1+
  COMPOUND MAINTENANCE TOOLS ........7/105+
  DRYING IE KILNS ...................34/201+
  HEATING AND COOLING SYSTEM ........165/48.1
  HEATING SYSTEM ....................237
  HOUSE TRAILER .....................D12/103
  MOVING ............................52/143
     PORTABLE TRACK .................238/13
  NUMBERS
     FLUORESCENT ....................250/462.1
     LUMINOUS .......................40/542
     PLATE ..........................D20/10+
  PLUMBING (SEE PLUMBING) ...........4/211+
  TOY ...............................446/476+
     CONSTRUCTION ...................446/108+
     FURNISHINGS ....................446/479+
  VENTILATION .......................454
     TOILET .........................4/209.R+

HOUSEBOAT
  DESIGN ............................D12/315

HOUSECOAT OR ROBE ................... D02/724+

HOUSEHOLD ARTICLES .................. D07
  LINEN .............................D06/595+
  MEASURING IMPLEMENT ...............D10/46.2


HOUSING
  ABRADING APPARATUS ................51/268+
  ANIMAL CONFINING AND ..............119/15+
  BRUSH AND BROOM ...................15/184+
  CLOSURE SEALS .....................292/317
  COMBINATION LOCK ..................70/443
     FENCE SUPPORTED BY .............70/322
  ELECTRICITY CONDUCTORS ............174/50
     FLUID OR VACUUM TYPE ...........174/17.R+
     WALL MOUNTED ...................174/48+
  FOR AN ELECTRICAL DEVICE ..........174/50+
  FOR DIFFERENT ELECTRICAL DEVICES ..361/600+
  FOR SPECIFIC ELECTRICAL DEVICE
     (SEE THE TYPE OF DEVICE)
  KEY OPERATED LOCKS ................70/448+
  LOCK ON ROTARY SHAFT ..............70/184+
  LOCK ON VALVE .....................70/179
  MATERIAL TREATING DRUM WITH GAS    34/139
     FLOW ...........................34/139
     HEATING ........................34/133.R
  METAL ROLLING APPARATUS ...........72/237+
  PADLOCK ...........................70/52
     NONSHACKLE TYPE ................70/33
  RADIO RECEIVER ....................455/347+
     VEHICLE ........................455/343+
  ROTARY SHAFTING ...................464/170+
     SHAFT COMBINED .................464/52+
  SWINGING DOOR LOCKS
     INTERFITTING KEEPER AND ........70/102+
     SWINGING DEADBOLT TYPE .........70/136
  SWITCHBOARD .......................361/600+
  TELEVISION ........................358/254
  THERMOMETER .......................374/208+
  TRANSCEIVER .......................455/90
  TRANSMITTER .......................455/128
  TUNER WITH ........................334/85

HOVERING VEHICLES ................... 180/116+

HOWITZERS SEE GUN


HUB
  AUTOMOBILE LIGHT COMBINED .........362/78
  BEARING
     BALL ...........................384/544
     ROLLER .........................384/589
  BRAKE
     OPERATOR .......................188/114
     TRANSMISSION ...................192/6.R
     VEHICLE ........................188/17+
     VELOCIPEDE .....................188/26
  CAP ...............................301/108.1+
     LOCK ...........................70/259+
  GROOVE RAILWAY ....................295/45+
  IMPELLER ..........................416/204.R+
  LAND VEHICLE ......................301/105.1+
     COMPRESSION PLURAL SPOKE SERIES 301/74+
     COMPRESSION SINGLE SPOKE SERIES 301/80+
     TENSION ........................301/59+
     WRENCH .........................301/116
  MANUFACTURE AND ASSEMBLY ..........29/894.36+
     BORING .........................408/72.R
     SPECIAL WOODWORKING MACHINES ...144/16
  RUNNER VEHICLE ....................280/14
  WRENCH ............................81/75+

HUB ODOMETERS ....................... 235/95.B+

HULL
  AIRSHIP ...........................244/125
  CLEANING IMPLEMENTS ...............114/222
  ROTARY FOR PROPULSION .............440/99
  SHIP ..............................114/56+
  SMALL BOAT ........................114/355+

HULLER (SEE HUSKER)
  BOLL ..............................19/35+
     GIN SAW COMBINED ...............19/56
  CLOVER ............................460/15
  GRAIN
     ABRASIVE OR IMPACT .............99/600+
     APPARATUS COMBINED .............241/101.1
     BY SOLID AGENT .................426/483
     OTHER COMMINUTION COMBINED .....241/7
  NUT ...............................99/568+
     SKINNER OR BLANCHER ............99/623+


HULLING
  GRAIN .............................426/481+
     APPARATUS ......................99/600+

HUM BUCKING IN AN AMPLIFIER ......... 330/149

HUMAN CHORIONIC GONADOTROPIN, HCG,    436/818*
 TESTING ............................436/818*

HUMANITIES, COMPUTER APPLICATIONS ... 364/419.1+

HUMIDIFIERS GAS ..................... 261
  AIR HEATING FURNACE COMBINED ......126/113
  AUTO HUMIDIFIER ...................261/DIG.4
  CABINET COMBINED ..................312/31+
  DESIGN ............................D23/359
  DRIER COMBINED ....................34
  DUCT ..............................261/DIG.15
  GAS SEPARATION COMBINED ...........96
  PAD RETAINING MEANS IN ............261/DIG.41
  RADIATOR COMBINED .................237/78.R
  RESIDUE PREVENTION IN .............261/DIG.46
  SLOW DIFFUSERS ....................239/34+
  VENTILATOR COMBINED ...............454

HUMIDITY
  METER (SEE HYGROMETER)
  REGULATION (SEE AIR MOISTENER) ....236
     AUTOMATIC ......................261/DIG.34
     DRYING APPARATUS COMBINED ......34/50
     HEAT EXCHANGE PROCESS ..........165/3
     HEAT EXCHANGER COMBINED ........165/19+
     TOBACCO TREATMENT ..............131/303

HUMIDOR ............................. 312/31+
  DESIGN ............................D27/186+


HUMMING (SEE VIBRATION, DAMPERS)

HUMUS ............................... 71/24

HUNTING ............................. 43
  BELT WITH CARTRIDGE HOLDER ........D03/100
  BOATS .............................114/351
  COATS .............................2/94
  DECOYS ............................43/2+
  DESIGN, GENERAL ...................D22
  EQUIPMENT AND GAME CARRIERS .......224
  KNIFE .............................D22/118
  LICENSE HOLDER ....................40/642+
     BADGE ..........................40/1.5+
  TELESCOPIC GUN SIGHT ..............D16/132
  TRAPS .............................43/58+
     DESIGN .........................D22/119+

HURDLES ............................. 482/15+
  LAYOUTS ...........................472/85+

HURDY GURDY SEE ORCHESTRION

HUSBANDRY
  ANIMAL ............................119
     DESIGN .........................D30
  PLANT .............................47
     DESIGN .........................D08/1


HUSKER (SEE HULLER)
  CORN ..............................460/26+
  EAR SEPARATOR .....................99/585
  FEEDERS FOR .......................460/18
  GRAIN
     ABRASIVE OR IMPACT .............99/600+
     BY SOLID AGENT .................426/483
  PICKER COMBINED ...................56/103+
  PICKER CORNSTALK TYPE COMBINED ....56/64+
     POWER OPERATED .................56/14.1+
  PROCESS ...........................426/482+

HYBRID CELL FORMATION ............... 435/172.2
  X-ART COLLECTION ..................935/89*

HYDANTOIN ........................... 548/317.1+

HYDNOCARPIC ACID .................... 562/413

HYDRANT ............................. D23/234
  CHARGED SPRINKLER .................239/148
  STRUCTURE .........................137/272+
  SYRINGE ...........................604/150

HYDRASTININE ........................ 546/90

HYDRATE OF HYDROCARBON .............. 585/15

HYDRATORS LIME ...................... 422/162


HYDRAULIC
  ACCUMULATOR .......................138/26+
  APPARATUS
     AIRCRAFT CONTROL ...............244/226+
     BAR AND TUBE DRAWING ...........72/287+
     BULLDOZER BLADE CONTROL ........172/812
     CONVEYER .......................406
     PUMP ...........................415
     PUNCHING MACHINE ...............83/639.1
     PUSHING AND PULLING IMPLEMENTS .254/93.R
     SNOWPLOW BLADE CONTROL .........37/234
     TESTING ........................73/168
  BARK ROSSING ......................144/208.D
  BRAKE .............................188/151.R+
     ELECTRIC FLUID ALARM ...........340/450+
     FLUID ..........................252/71+
     FLUID ALARM ....................116/28.R+
     LINE VALVE .....................137/598
     PULSATOR .......................60/533+
  CEMENT
     COMPOSITION ....................106/638+
     GLASS COMBINED .................501/32
     MANUFACTURE ....................106/739+
  CLUTCH COUPLING OR TRANSMISSION ...74/730.1+
     ACCUMULATOR TYPE ...............138/26+
     PLANETARY GEARING COMBINED .....475/31+
     VEHICLE SPRING COMBINED ........267/2+
  DYNAMOMETERS ......................73/862+
     TENSILE STRAIN TESTING .........73/836
  ENDLESS FLEXIBLE TRACK ADJUSTING ..305/10
  ENGINEERING .......................405/52
     CAISSONS .......................405/8+
     DIVING .........................405/185+
     DRYDOCKS .......................405/4+
     MARINE STRUCTURES IN SHIFTING   405/195.1+
       MEDIA ........................405/195.1+
     MARINE WAYS ....................405/2
     PIPE & CABLE LAYING ............405/154+
     SHIP CAISSONS ..................405/12
     TUNNEL .........................405/132+
     UNDERGROUND FLUID STORAGE ......405/53+
     WATER CONTROL ..................405/52+
  JACK ..............................254/93.R
     MOTOR AND PUMP .................60/325+
  MAINS
     FLOW CONTROL ...................137
     STRUCTURE ......................138/177
  METAL INJECTOR ....................164/314+
  MOTOR REGULATORS ..................137/505+
     SPEED RESPONSIVE ...............415/30+
     TORQUE RESPONSIVE ..............415/30+
  MOTORS (SEE MOTOR) ................91
     PUMP COMBINED ..................60/325+
  POWER PLANTS ......................60/325+
  PRESS
     DIE SHAPING ....................72
     FORGING ........................72/453.1+
     MOTOR PUMP OPERATOR ............60/325+
     MULTIPLE MOTORS ................60/698+
     PRESSURE FLUID SOURCE & MOTOR ..60/325+
     SAND MOLD COMPACTOR ............164/212
  PROPULSION
     MOTOR ..........................60/200.1+
     RAILWAY CAR ....................104/154
     SHIP ...........................440/5+
  PUMP ..............................417
  RAM
     COMPRESSOR .....................417/104
     PUMP ...........................417/226+
  WEIGHING SCALE ....................177/208+

HYDRAZIDE (SEE AMIDE)

HYDRAZINE ........................... 423/407+
  EXPLOSIVE OR THERMIC
     COMPOSITION CONTAINING .........149/36
  ORGANIC ...........................564/310+
  REDUCING COMPOSITIONS .............252/188.1
  SULFATE ...........................423/388

HYDRAZOIC ACID ...................... 423/351

HYDRAZONES .......................... 564/250+

HYDRIDES ............................ 423/644
  REDUCING COMPOSITIONS .............252/188.25+

HYDRINDONE .......................... 568/327


HYDRINS ............................. 558/303+
  CHLOR .............................568/841+
     HYDROLYSIS OF ..................568/859+
  CYAN ..............................558/451+

HYDRIODIC ACID ...................... 423/481


HYDROCARBONS ........................ 585
  APPARATUS OF RECITED COMPOSITION ..585/920*
  APPARATUS STRUCTURE RECITED .......585/921*
     REACTOR FLUID MANIPULATING
       DEVICE .......................585/922*
     REACTOR SHAPE OR DISPOSITION ...585/924*
  AZEOTROPIC DISTILLATION WITH ......203/68+
  BLENDED OR COMPOSITION ............585/1+
  COMPOUND ..........................585/16+
  DRYING OIL HYDROCARBON ............585/945*
  FISCHER TROPSCH SYNTHESIS .........518/700+
  GAS SEPARATION ....................95
  HYDRATE OF ........................585/15
  INORGANIC MATERIAL CONVERSION .....585/943*
  LOW MOLECULAR WEIGHT POLYMER
     COMPOSITIONS ...................106/901*
  MINERAL OILS ......................208
  OPENING OF HYDROCARBON RING .......585/940*
  POLYMERIZED UNSATURATES ONLY  SEE  526/335+
     ALSO SYNTHETIC RESIN OR NATURAL 526/335+
     RUBBER .........................526/335+
  PURIFICATION ......................585/800+
  RADIANT RESISTANT COMPOSITION .....585/944*
     CARBONIUM ION PRODUCTION .......585/942*
  RECOVERING HYDROCARBON
     SOLVENT EXTRACTION .............585/833+
     WERNER COMPLEX FORMATION .......585/850
  RECYCLING
     DILUENT OR MASS-ACTION AGENT ...585/901*
     HYDROGEN TO CONTROL REACTION ...585/903*
     SOLVENT AND CATALYST ...........585/902*
  SYNTHESIS
     ALICYCLIC ......................585/350+
     AROMATIC .......................585/400+
     BY-PRODUCT CONVERSION TO FEED ..585/905*
     CONDITION-RESPONSIVE CONTROL IN 585/956*
       ALICYCLIC SYNTHESIS ..........585/956*
     COOLING BY EVAPORATION .........585/914*
     CORROSION PREVENTION ...........585/950*
     CYCLIC POLYMERIZATION ..........585/415
     DIELS-ALDER REACTION ...........585/361
     ISOTOPE EXCHANGE ...............585/941*
     MASS-ACTION PHENOMENON .........585/954*
     PULSED, SONIC, PLASMA PROCESSES 585/953*
     REHABILLITATION OF HYDROGEN     585/900*
       ACCEPTOR .....................585/900*
     SATURATED ......................585/700+
     SPECIFIED MIXING PROCEDURE .....585/955*
     START-UP PROCEDURE .............585/951*
     STOPPING OR RETARDING PROCEDURE 585/952*
     UNSATURATED ....................585/500+
  WAXY HYDROCARBON POLYMER PRODUCTION585/946*


HYDROCELLULOSE ...................... 536/56+
  NITROGEN CONTAINING ...............536/30+

HYDROCEPHALUS PUMPS ................. 604/8

HYDROCHLORIC ACID ................... 423/481+

HYDROCINNAMIC ACID .................. 562/496

HYDROCORTISONE ...................... 552/577

HYDROCORTISONE, IN DRUG ............. 514/179

HYDROCRACKING
  MINERAL OIL .......................208/46+
  PARAFFIN SYNTHESIS ................585/752

HYDROCYANIC ACID .................... 423/364
  ELECTROLYTIC PRODUCTION OF ........204/63

HYDROFLUORIC ACID ................... 423/481

HYDROFLUOSILIC ACID ................. 423/341


HYDROFOILS .......................... 114/274

HYDROGEN ............................ 423/648.1+
  ALLOYS FOR STORAGE ................420/900*
  CARBURETING .......................48/199.R
     APPARATUS ......................48/116+
  COMPOSITIONS CONTAINING ...........252/372+
  ELECTROLYTIC SYNTHESIS ............204/129
  EXCHANGE DISPROPORTIONATION
     HYDROGENATION BY ...............585/257
     OLEFIN SYNTHESIS BY ............585/656
  GENERATIVE COMPOSITION ............252/188.1+
  ION
     TESTING ELECTROLYTIC APPARATUS .204/433
     TESTING ELECTROLYTIC PROCESSES .204/1.11
     TESTING SYSTEMS ................324/438
  PEROXIDE ..........................423/584+
     ELECTROLYTIC SYNTHESIS .........204/84
     ELECTROSTATIC FIELD OR
       ELECTRICAL DISCHARGE SYNTHESIS204/175
     TREATMENT ......................430/943*
  SULPHIDE
     SYNTHETIC RESIN OR NATURAL
       RUBBER VULCANIZATION WITH ....525/343+

HYDROGENATION
  CO ................................518/700+
  COAL ..............................208/400+
  ELECTROLYTIC ......................204/73.R+
  FATTY OILS ........................554/141+
  HYDROCARBONS ......................585/250+
     AROMATIC .......................585/266+
     SYNTHESIS ......................585/250+
  MINERAL OILS ......................208
  NATURAL RESINS ....................530/200+
  NO2 COMPOUND REDUCTION ............564/416+
  POLYMERS ..........................525/338+
  ROSIN .............................530/223


HYDROLYSIS
  ALKYL HALIDES TO ALCOHOLS .........568/891+
  ALKYL SULFATES TO ALCOHOLS ........568/886+
     POLYHYDRIC .....................568/858
  APPARATUS FOR CARBOHYDRATE ........127/1
  CARBOHYDRATE ......................127/36+
  FATS OILS WAXES ...................554/160+
  FERMENTATIVE ......................435
  HALIDES TO PHENOLS ................568/796

HYDROMETALLURGY ..................... 75/711+

HYDROMETER .......................... 73/441+
  CHEMICAL ANALYSIS, APPARATUS ......422/82.5
  DESIGN ............................D10/84
  DESIGN ............................D10/84
  INTEGRAL WITH BATTERY .............429/90+

HYDROPHENANTHRENE CARBOXYLIC ACID     560/5+
 ESTERS .............................560/5+

HYDROPHILIC CELLULAR SYNTHETIC RESIN  521/905*
 OR NATURAL RUBBER ..................521/905*

HYDROPHOBIC CELLULAR SYNTHETIC RESIN  521/905*
 OR NATURAL RUBBER ..................521/905*

HYDROPHONE .......................... 367/140+

HYDROPHTHALIC ACID .................. 562/509


HYDROPLANE BOATS .................... 114/271+

HYDROPONICS ......................... 47/59+

HYDROQUINONE ........................ 568/763+

HYDROSOLS (SEE COLLOIDS)

HYDROSTATIC EXTRUSION ............... 72/711*

HYDROTHERAPY UNITS .................. D24/201+

HYDROXAMATE ESTERS .................. 560/312+

HYDROXIDE (SEE HYDROXY COMPOUNDS)
  ALKALI METAL ELECTROLYTIC
     TREATMENT ......................204/153
  AMMONIUM ELECTROLYTIC PRODUCTION ..204/102
  BASES .............................423/592
  BINDANT OR REACTANT ...............252/193
  ELECTROLYTIC PRODUCTION OF ........204/96+

HYDROXYLAMINE ORGANIC ............... 564/300+
  O-ESTERS, O-ETHERS ................564/300


HYGIENE, FEMININE
  TAMPONS ...........................604/358+
  X-ART COLLECTION ..................604/904*

HYGROMETER .......................... 73/29.2+
  DIELECTRIC ........................324/663+
  ELECTRIC
     CAPACITANCE CHANGE .............324/665
     RESISTANCE CHANGE ..............324/694

HYGROSCOPE .......................... 73/29.2+
  COOLER COMBINED ...................62/130
     AUTOMATIC ......................62/126

HYGROSCOPIC COMPOSITIONS ............ 252/194
  REFRIGERATED GAS DRYING ...........62/271
     PROCESS ........................62/94
  REFRIGERATION UTILIZING ...........62/476+
     AUTOMATIC ......................62/141+
     PROCESS ........................62/101+
     VACUUMIZED CHAMBER .............62/269

HYGROSTAT ........................... 73/29.2+
  HUMIDITY CONTROL ..................236/44.R
  REFRIGERATION CONTROL .............62/176.1

HYPNOTIC COMPOSITION ................ 424

HYPO ................................ 423/511+


HYPOCHLORITE ........................ 423/473
  BIOCIDES CONTAINING ...............424/661+
  BLEACHING COMPOSITION .............252/187.1+
  DETERGENT COMPOSITIONS ............252/95+

HYPODERMIC
  AMMUNITION ........................102/512
  SURGICAL ..........................604/187+
     DESIGN .........................D24/113+
  SYRINGE PACKAGE ...................206/364+

HYPOHALITE ESTERS ................... 560/300

HYPOLON T M (SEE SYNTHETIC RESIN OR NATURAL RUBBER)

HYPONITRITE ESTERS .................. 560/316

HYPOPHOSPHITES INORGANIC ............ 423

HYPOSULPHITES ....................... 423/511

HYPOXANTHINE - SEE INOSINE .......... 536/27.8