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Class Information
Number: 333/175
Name: Wave transmission lines and networks > Coupling networks > Frequency domain filters utilizing only lumped parameters > Resonant, discrete frequency selective type
Description: Subject matter which include resonant series and/or parallel inductance and capacity networks which offer a low impedance path to energy of a particular frequency or of a plurality of separate discrete frequencies and/or offer a high impedance path to energy of a particular frequency or of a plurality of discrete frequencies.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5717368 |
Varactor tuned helical resonator for use with duplex filter |
Feb. 10, 1998 |
| 5703438 |
Line current filter for less than 10% total harmonic distortion |
Dec. 30, 1997 |
| 5703545 |
High frequency filter circuit |
Dec. 30, 1997 |
| 5668418 |
Three-phase filter equipment including standby filter branch for switchably replacing a removed filter branch for a particular phase |
Sep. 16, 1997 |
| 5644598 |
Switching arrangement for coupling a transmitting unit to a transmission line |
Jul. 1, 1997 |
| 5627502 |
Resonator filter with variable tuning |
May. 6, 1997 |
| 5625894 |
Switch filter having selectively interconnected filter stages and ports |
Apr. 29, 1997 |
| 5623543 |
Two port signalling voltages filter arrangement |
Apr. 22, 1997 |
| 5612656 |
Resonator with spiral-shaped pattern electrodes |
Mar. 18, 1997 |
| 5594395 |
Diode tuned resonator filter |
Jan. 14, 1997 |
| 5576673 |
Small, low-pass filter for high power applications |
Nov. 19, 1996 |
| 5559396 |
Ballast filtering scheme for reduced harmonic distortion |
Sep. 24, 1996 |
| 5543756 |
Combined crystal and LC filter |
Aug. 6, 1996 |
| 5541558 |
Capacitively-tapped, variable, wideband bandpass filter |
Jul. 30, 1996 |
| 5535087 |
Circuit for reducing effects of transient events on electronic equipment |
Jul. 9, 1996 |
| 5521564 |
Resonator and chip-type filter using it |
May. 28, 1996 |
| 5506551 |
Resonator and chip type filter using the resonator |
Apr. 9, 1996 |
| 5497417 |
Switching device for transmitting telecommunication signals |
Mar. 5, 1996 |
| 5404118 |
Band pass filter with resonator having spiral electrodes formed of coil electrodes on plurality of dielectric layers |
Apr. 4, 1995 |
| 5400000 |
Band-pass filter having two loop-shaped electrodes |
Mar. 21, 1995 |
| 5392011 |
Tunable filter having capacitively coupled tuning elements |
Feb. 21, 1995 |
| 5382927 |
Band-pass filter having two looped-shaped electrodes |
Jan. 17, 1995 |
| 5381117 |
Resonator having loop-shaped electrode |
Jan. 10, 1995 |
| 5379009 |
Active-type band-pass filter |
Jan. 3, 1995 |
| 5376907 |
High-frequency tunable filter |
Dec. 27, 1994 |
| 5351020 |
Band-pass filter having three or more loop-shaped electrodes |
Sep. 27, 1994 |
| 5343381 |
Electrical dampening circuit for dampening resonance of a power signal in a power distribution network |
Aug. 30, 1994 |
| 5331299 |
Adaptive tracking notch filter system |
Jul. 19, 1994 |
| 5323304 |
A.C. storage module for reducing harmonic distortion in an A.C. waveform |
Jun. 21, 1994 |
| 5285177 |
Antenna sharing device using mutually coupled resonant circuits |
Feb. 8, 1994 |
| 5278525 |
Electrical filter with multiple filter sections |
Jan. 11, 1994 |
| 5262677 |
Reactor subsynchronous tuning scheme |
Nov. 16, 1993 |
| 5260862 |
A-C power line filter |
Nov. 9, 1993 |
| 5256997 |
Linear phased filter for reducing ripple in group delay |
Oct. 26, 1993 |
| 5231078 |
Thin film superconducting LC network |
Jul. 27, 1993 |
| 5227962 |
Filter and power factor compensation network |
Jul. 13, 1993 |
| 5224029 |
Power factor and harmonic correction circuit including ac startup circuit |
Jun. 29, 1993 |
| 5202584 |
High energy dissipation harmonic filter reactor |
Apr. 13, 1993 |
| 5193213 |
FM broadcast band subcarrier receiver |
Mar. 9, 1993 |
| 5192924 |
Filter circuit for attenuating high frequency signals |
Mar. 9, 1993 |
| 5187457 |
Harmonic and subharmonic filter |
Feb. 16, 1993 |
| 5184096 |
Parallel connection multi-stage band-pass filter comprising resonators with impedance matching means capacitively coupled to input and output terminals |
Feb. 2, 1993 |
| 5180999 |
Filter system with controlled amplitude in stopband or passband |
Jan. 19, 1993 |
| 5168251 |
Quality factor improvement for filter application |
Dec. 1, 1992 |
| 5166621 |
Multi-resonant NMR coils |
Nov. 24, 1992 |
| 5157362 |
Narrow band notch filter with extended passband |
Oct. 20, 1992 |
| 5150085 |
Electronically tunable front end filter for radio apparatus |
Sep. 22, 1992 |
| 5148133 |
Quality factor improvement for filter applications |
Sep. 15, 1992 |
| 5148359 |
Network for obtaining high power and low total harmonic distortion |
Sep. 15, 1992 |
| 5148360 |
Fourth order damped lowpass filter for obtaining high power factor and low total harmonic distortion |
Sep. 15, 1992 |
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