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Class Information
Number: 333/176
Name: Wave transmission lines and networks > Coupling networks > Frequency domain filters utilizing only lumped parameters > Resonant, discrete frequency selective type > Including specific frequency rejection means
Description: Subject matter which include circuitry, provided for rejecting harmonics or for providing discrete transmission zeroes or attenuation poles within, at the edge of, or outside of, a prescribed filter pass band.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5932522 |
Superconducting radio-frequency bandstop filter |
Aug. 3, 1999 |
| 5893025 |
CATV converter for receiving both analog and digital signals |
Apr. 6, 1999 |
| 5880649 |
Multilayered frequency separator |
Mar. 9, 1999 |
| 5864185 |
Sub-synchronous resonance filters for series capacitors |
Jan. 26, 1999 |
| 5841329 |
Variable trap circuit |
Nov. 24, 1998 |
| 5818309 |
Microwave active notch filter and operating method with photonic bandgap crystal feedback loop |
Oct. 6, 1998 |
| 5815052 |
High-frequency composite components comprising first and second circuits connected in parallel for multi-frequency systems |
Sep. 29, 1998 |
| 5805032 |
Electrical filter for attenuating oscillations in AC mains |
Sep. 8, 1998 |
| 5721521 |
Notch-enhancement in band-reject filters |
Feb. 24, 1998 |
| 5717368 |
Varactor tuned helical resonator for use with duplex filter |
Feb. 10, 1998 |
| 5619080 |
Line filter for reducing AC harmonics |
Apr. 8, 1997 |
| 5616539 |
High temperature superconductor lumped element band-reject filters |
Apr. 1, 1997 |
| 5602516 |
Asymmetrical notch filter |
Feb. 11, 1997 |
| 5559396 |
Ballast filtering scheme for reduced harmonic distortion |
Sep. 24, 1996 |
| 5497417 |
Switching device for transmitting telecommunication signals |
Mar. 5, 1996 |
| 5440282 |
Filter structure with anti-rotation keying |
Aug. 8, 1995 |
| 5438304 |
Automatically tuned notch filter for providing bandpass and band reject signals |
Aug. 1, 1995 |
| 5432488 |
Electrical signal filter |
Jul. 11, 1995 |
| 5420585 |
Digital to analog conversion devices |
May. 30, 1995 |
| 5387821 |
Power distribution circuit with power factor correction and independent harmonic current filter |
Feb. 7, 1995 |
| 5331299 |
Adaptive tracking notch filter system |
Jul. 19, 1994 |
| 5285177 |
Antenna sharing device using mutually coupled resonant circuits |
Feb. 8, 1994 |
| 5262677 |
Reactor subsynchronous tuning scheme |
Nov. 16, 1993 |
| 5260862 |
A-C power line filter |
Nov. 9, 1993 |
| 5250907 |
Digital signal measurement apparatus |
Oct. 5, 1993 |
| 5227962 |
Filter and power factor compensation network |
Jul. 13, 1993 |
| 5227745 |
Line filter assembly |
Jul. 13, 1993 |
| 5202651 |
Band-stop filter circuit suitably made into monolithic microwave integrated circuits |
Apr. 13, 1993 |
| 5202656 |
Frequency shifting tuning process and filter structure |
Apr. 13, 1993 |
| 5180999 |
Filter system with controlled amplitude in stopband or passband |
Jan. 19, 1993 |
| 5159711 |
Interference filter with high degree of selectivity for TVRO receiver system |
Oct. 27, 1992 |
| 5157362 |
Narrow band notch filter with extended passband |
Oct. 20, 1992 |
| 5155457 |
Line filter assembly |
Oct. 13, 1992 |
| 5121078 |
Filtering cell and corresponding filter |
Jun. 9, 1992 |
| 5105172 |
Monolithically realizable radio frequency bias choke |
Apr. 14, 1992 |
| 5095285 |
Monolithically realizable harmonic trapping circuit |
Mar. 10, 1992 |
| 5068893 |
Television signal processing network for subscription television jamming signals |
Nov. 26, 1991 |
| 5065453 |
Electrically-tunable bandpass filter |
Nov. 12, 1991 |
| 5036302 |
Radio receiver filter with image rejection |
Jul. 30, 1991 |
| 5032807 |
Notch filter using helical transmission line and coaxial capacitor |
Jul. 16, 1991 |
| 5028895 |
Notch filter for reducing clock signal feedthrough effects in an acoustic charge transport device |
Jul. 2, 1991 |
| 4965539 |
Microwave notch filter using pin diode shunted YIG resonators |
Oct. 23, 1990 |
| 4954785 |
Auto tracking notch filter using switched capacitors to measure harmonic distortion and noise contained in a signal source |
Sep. 4, 1990 |
| 4945332 |
Noise suppression inductor |
Jul. 31, 1990 |
| 4939779 |
Temperature compensated trap filter |
Jul. 3, 1990 |
| 4920563 |
Circuit compensating for the attenuation of a notch filter at frequencies less than cut-off frequency thereof |
Apr. 24, 1990 |
| 4901043 |
Compact filter having a multi-compartment housing |
Feb. 13, 1990 |
| 4795990 |
Trap circuit with two variable inductors |
Jan. 3, 1989 |
| 4779068 |
Noise suppression inductor |
Oct. 18, 1988 |
| 4768002 |
Power filter resonant frequency modulation network |
Aug. 30, 1988 |
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