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: 332
Class Title: MODULATORS
Subclass Subclass
Number Title
100 FREQUENCY SHIFT KEYING MODULATOR OR MINIMUM SHIFT KEYING
MODULATOR
101 .Including logic element (e.g., logic gate or flip-flop)
102 .Including discrete semiconductor device
103 PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR
104 .Including logic element (e.g., logic gate or flip-flop)
105 .Including discrete semiconductor device
106 PULSE OR INTERRUPTED CONTINUOUS WAVE MODULATOR
107 .Including stabilization or alternatively distortion, noise or
other interference prevention, reduction or compensation
108 .Plural modulation
109 .Pulse width modulator
110 ..Including discrete semiconductor device having three or more
electrodes
111 ..Including electron discharge device
112 .Pulse position, frequency, phase, or spacing modulator
113 ..Including discrete semiconductor device having three or more
electrodes
114 ..Including electron discharge device
115 .Pulse amplitude modulator
116 ..Including discrete semiconductor device having three or more
electrodes
117 FREQUENCY MODULATOR
118 .Including measuring or indicating
119 .Plural modulation
120 ..Including amplitude modulation
121 ...Including electron discharge device
122 ..Including electron discharge device
123 .Including stabilization or alternatively distortion, noise or
other interference prevention, reduction, or compensation
124 ..Nonlinearity reduction or compensation
125 ..Automatic amplitude stabilization or control
126 ..Automatic frequency stabilization or control
127 ...Phase or frequency locked loop
128 ....Modulating signal applied to plural elements of the loop
129 .Including microwave or distributed parameter structure
130 ..With discrete semiconductor device
131 ..With electron discharge device
132 ...Magnetron type
133 ...Klystron type
134 ...Travelling wave type
135 .Including discrete semiconductor device
136 ..With varactor
137 .Including electron discharge device
138 ..Particular oscillator circuit
139 ...Crystal oscillator type
140 ....With separate modulator tube (e.g., reactance tube)
141 ...L-C oscillator type
142 ....With separate modulator tube (e.g., reactance tube)
143 .....Plural modulator tubes
144 PHASE MODULATOR
145 .Including amplitude modulatorr
146 .Including discrete semiconductor device
147 .Including electron discharge device
148 ..Push-pull circuit
149 AMPLITUDE MODULATOR
150 .Including measuring or indicating
151 .Plural modulation
152 ..Including discrete semiconductor device
153 ..Including electron discharge device
154 ...Push-pull circuit
155 .Percent modulation control or automatic amplitude control of
carrier or modulating signal
156 ..Overmodulation prevention
157 ..Average carrier amplitude controlled by modulating signal
158 ..Carrier output suppressed during absence of modulating signal
159 .Including stabilization or alternatively distortion, noise or
other interference prevention, reduction or compensation
160 ..Reduction or compensation of nonlinearity in modulation
characteristic
161 ..Reduction of carrier phase or frequency variations or
modulation
162 ..Using feedback to reduce distortion, noise or other
interference
163 .Including microwave or distributed parameter structure
164 ..With discrete semiconductor device
165 ..With electron discharge device
166 ...Magnetron type
167 .Suppressed carrier double sideband type
168 ..Including discrete semiconductor device
169 ..Including electron discharge device
170 .Single or vestigial sideband type
171 ..Including electron discharge device
172 .Modulating signal applied to a bridge circuit
173 .Magnetic field varied by modulating signal
174 .Resistive or dissipative device controlled by modulating signal
(e.g., loss modulator)
175 .Variable reactance controlled by modulating signal
176 .Nonlinear device controlled by modulating signal
177 ..Nonlinear discrete semiconductor device
178 .Including discrete semiconductor device
179 .Including electron discharge device
180 ..Push-pull circuit
181 ..Plate circuit modulation
182 ..Grid circuit modulation
183 MODULATION CONVERTER HAVING PRE-MODULATED INPUT (E.G., FM TO
AM)
184 .Between diverse pulse modulation types
185 MISCELLANEOUS