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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 |
| 4748667 |
Jamming signal scrambling and descrambling systems for CATV |
May. 31, 1988 |
| 4743873 |
Highpass filter of a filter arrangement for a three-phase network connected to converters |
May. 10, 1988 |
| 4731587 |
Enhanced quadrature notch filter |
Mar. 15, 1988 |
| 4710735 |
Absorption circuit |
Dec. 1, 1987 |
| 4701725 |
Radio frequency signal coupler |
Oct. 20, 1987 |
| 4694266 |
Notch filter |
Sep. 15, 1987 |
| 4682125 |
RF coil coupling for MRI with tuned RF rejection circuit using coax shield choke |
Jul. 21, 1987 |
| 4662001 |
Tunable notch filter for image frequency and conducted local oscillator leakage rejection |
Apr. 28, 1987 |
| 4642691 |
Television signal input filter |
Feb. 10, 1987 |
| 4633184 |
Device for generating a signal corresponding to a variable magnitude associated with the reactive power of an arc furnace in order to control a reactive power compensator |
Dec. 30, 1986 |
| 4623918 |
Pay television system utilizing multi-frequency passive filters |
Nov. 18, 1986 |
| 4601062 |
Tracking image frequency trap |
Jul. 15, 1986 |
| 4599587 |
Impedance element |
Jul. 8, 1986 |
| 4586007 |
Notch filter |
Apr. 29, 1986 |
| 4577168 |
Notch filter |
Mar. 18, 1986 |
| 4574201 |
Radio frequency switching circuit device |
Mar. 4, 1986 |
| 4571560 |
Switched bandpass filter |
Feb. 18, 1986 |
| 4554516 |
Frequency source having YIG absorption/transmission filter |
Nov. 19, 1985 |
| 4551780 |
Apparatus for reducing subsynchronous frequencies in a power supply |
Nov. 5, 1985 |
| 4509024 |
Impedance bond |
Apr. 2, 1985 |
| 4496859 |
Notch filter system |
Jan. 29, 1985 |
| 4490699 |
Intermediate frequency band-pass filter |
Dec. 25, 1984 |
| 4480338 |
Lowpass-highpass electronic switch |
Oct. 30, 1984 |
| 4468644 |
Tunable reject filter for radar warning receiver |
Aug. 28, 1984 |
| 4460879 |
Variable tuning device |
Jul. 17, 1984 |
| 4453145 |
Band pass filter |
Jun. 5, 1984 |
| 4435841 |
Communications receiver having a switchable filter input stage |
Mar. 6, 1984 |
| 4433315 |
Tunable coupling network |
Feb. 21, 1984 |
| 4426630 |
Electronically tunable band reject filter |
Jan. 17, 1984 |
| 4414517 |
Non-ringing phase responsive detector |
Nov. 8, 1983 |
| 4412351 |
Microwave mixing circuit |
Oct. 25, 1983 |
| 4395688 |
Linear phase filter with self-equalized group delay |
Jul. 26, 1983 |
| 4387352 |
Transducer array crossover network |
Jun. 7, 1983 |
| 4383229 |
Resonant filter clipper circuit |
May. 10, 1983 |
| 4349795 |
RF Trap for a cable television trunk amplifier station |
Sep. 14, 1982 |
| 4334203 |
Second harmonic suppressor for power amplifier tank circuit |
Jun. 8, 1982 |
| 4328474 |
Electrical energy storage type filter |
May. 4, 1982 |
| 4308575 |
Power source system |
Dec. 29, 1981 |
| 4287602 |
Rejection filter to remove TV channel 6 and FM radio interference |
Sep. 1, 1981 |
| 4272743 |
Method for tuning a filter circuit |
Jun. 9, 1981 |
| 4263619 |
Double trapping of adjacent channel sound |
Apr. 21, 1981 |
| 4249147 |
Cavity filter and multi-coupler utilizing same |
Feb. 3, 1981 |
| 4228492 |
Circuit arrangement and method for the compensation of harmonic currents |
Oct. 14, 1980 |
| 4224660 |
Composite filter for suppressing harmonic frequencies on electric power transmission lines |
Sep. 23, 1980 |
| 4215325 |
Minimal distortion video bandpass filter |
Jul. 29, 1980 |
| 4211977 |
Mixer circuit arrangement |
Jul. 8, 1980 |
| 4209757 |
Circuit for compensating harmonic currents in an electric consumer arrangement |
Jun. 24, 1980 |
| 4206428 |
Series notch filter and multicoupler utilizing same |
Jun. 3, 1980 |
| 4198612 |
Image analysis nonlinear adaptive filter for improving signal-to-noise ratio |
Apr. 15, 1980 |
| 4188598 |
Electrical filter |
Feb. 12, 1980 |
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