What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
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363-131 121-55A 14-.5
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Class Number: 503
Class Title: RECORD RECEIVER HAVING PLURAL LEAVES OR A COLORLESS COLOR
FORMER, METHOD OF USE, OR DEVELOPER THEREFOR
Subclass Subclass
Number Title
200 HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD
OF USE
201 .Method of use, kit, or combined with marking instrument or
organ
202 .Color developed by mere decomposition of color-former
203 .Duplicating master
204 .Plural colors or plural diverse systems
205 .Having a color desensitizer
206 .Component noncoextensive with substrate
207 .Having nonreactant particles of defined size
208 .Having constituent defined in terms of melting temperature
209 .Having nonchromogenic liquid spread-control or
transfer-improving agent or component, color modifier,
stabilizer or preservative
210 .Heavy metal reactant
211 ..Metal of atomic number 22-30
212 ...Zinc
213 .Identified solvent or dispersant for color-former, other than
mere mineral oil
214 .Identified reactant isolating material or capsule wall material
or binder resin
215 ..Synthetic resin capsule walls
216 .Identified organic electron acceptor (developer) other than
phenolic resin
217 ..And identified color-former
218 .Identified color-former
219 ..And identified inorganic electron acceptor (developer), other
than mere clay
220 ..Furanone moiety-containing
221 ...Fluoran or derivative
222 ....Molecule having plural fluorans or more than three rings
fused together
223 ..Azole moiety-containing
224 ..Polyphenylmethane moiety-containing
225 .Identified electron acceptor (developer)
226 .Spatial relationship specified between color-former and
developer
227 HAVING PLURAL INTERACTIVE LEAVES