Class 329: DEMODULATORS ( Manual of U.S. Patent Classification )

U.S. PATENT AND TRADEMARK OFFICE
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[Manual of Classification, Class Listing]

Manual of U.S. Patent Classification
as of June 30, 2000

Class
329
DEMODULATORS

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Subclass		Title
ClassTitle		===> DEMODULATORS

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

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Last Modified: 6 October 2000

Manual of U.S. Patent Classification as of June 30, 2000

Class 329 DEMODULATORS

Manual of U.S. Patent Classification
as of June 30, 2000

Class
329
DEMODULATORS