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