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: 329
Class Title: DEMODULATORS
Subclass Subclass
Number Title
300 FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR
301 .Including discrete semiconductor device
302 .Input signal combined with local oscillator or carrier
frequency signal
303 .Including logic element (e.g., logic gate or flip-flop
304 PHASE SHIFT KEYING OR QUADRATURE AMPLITUDE DEMODULATOR
305 .Including discrete semiconductor device
306 .Input signal combined with local oscillator or carrier
frequency signal
307 ..Including phase or frequency locked loop
308 ...With parallel signal combiners (e.g., Costas loop)
309 ....Including logic element (e.g., logic gate or flip-flop)
310 .Including logic element (e.g., logic gate or flip-flop)
311 PULSE OR INTERRUPTED CONTINUOUS WAVE DEMODULATOR
312 .Pulse width demodulator
313 .Pulse position, frequency, phase or spacing demodulator
314 ..Including discrete semiconductor device
315 FREQUENCY MODULATION DEMODULATOR
316 .Plural demodulation
317 ..Including amplitude demodulation
318 .Having specific distortion, noise or other interference
prevention, reduction or compensation
319 ..Using feedback to reduce distortion, noise or other
interference
320 ..By cancelling distortion, noise or other interference
321 ..Using amplitude limiting within the demodulator
322 .Including microwave or distributed parameter structure
323 .Input signal combined with local oscillator or carrier
frequency signal
324 ..Input signal applied directly to local oscillator
325 ..Including phase or frequency locked loop
326 ...Including discrete semiconductor device
327 .Input signal split into plural signals
328 ..Including piezoelectric resonant element
329 ..Using a transformer to split input signal
330 ...Signals taken from primary and secondary windings
331 ....Including plural detector diodes (e.g., ratio detector
type)
332 ...Signals taken from plural secondary windings
333 ....Including plural detector diodes (e.g., ratio detector
type)
334 .....Including resonant circuits tuned above and below input
signal carrier frequency
335 ...Including plural detector diodes (e.g., ratio detector type)
336 ..Input signal combined with phase shifted or delayed portion of
input signal
337 ...Including LC resonant phase shift circuit
338 ..Input signal split by LC resonant circuit
339 ...Including LC resonant circuits tuned above and below input
signal carrier frequency
340 ..Including plural detector diodes (e.g., ratio detector type)
341 .Input signal converted to and processed in pulse form (e.g.,,
pulse counter or digital type demodulator)
342 ..Including discrete semiconductor device
343 ..Including digital logic circuitry
344 .Including signal passed through single demodulating path
including resonant circuit
345 PHASE MODULATION DEMODULATOR
346 .Input signal combined with local oscillator or carrier
frequency signal
347 AMPLITUDE MODULATION DEMODULATOR
348 .Having plural demodulation outputs
349 .Having specific distortion, noise or other interference
prevention, reduction or compensation
350 ..Automatic amplitude stabilization or control
351 ..Nonlinearity reduction or compensation
352 ..Temperature compensation
353 ..Noise reduction or compensation
354 .Including microwave or distributed parameter structure
355 ..With electron discharge device
356 .Suppressed carrier double sideband type
357 .Single or vestigial sideband type
358 .Input signal combined with local oscillator or carrier
frequency signal (e.g., synchronous demodulator)
359 ..Input signal applied directly to local oscillator
360 ..Including phase or frequency locked loop
361 ..Including sampling, gating, or switching
362 ...With three or more terminal discrete semiconductor device
363 .Input signal split into plural signals
364 ..Including three or more terminal discrete semiconductor
device
365 ..Including diode demodulator device
366 ...Plural diodes
367 .Including regenerative feedback in non-oscillating demodulator
368 .Electron discharge demodulator device having more than two
electrodes (e.g., triode, tetrode etc.)
369 .Including three or more terminal discrete semiconductor
demodulator device
370 .Including diode demodulator device
371 .Coherer type demodulator
372 MISCELLANEOUS