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Class Information
Number: 334/78
Name: Tuners > Variable capacitor tuned
Description: Subject matter wherein a parallel tuned circuit consists of an inductor of fixed inductance value and a tuning capacitor, the capacitance value of which may be varied over a given range in order to tune the circuit over a range or band of frequencies.

Sub-classes under this class:

Class Number Class Name Patents
334/84 Capacitor drive means 3
334/83 Gang-operated capacitors 5
334/81 Rectilinearly sliding plates 4
334/79 Straight-line frequency type 2
334/82 With particular shape and/or arrangement of plates 7
334/80 With variable spacing between plates 5

Patents under this class:

Patent Number Title Of Patent Date Issued
8598992 Self-calibrating RFID transponder Dec. 3, 2013
8207802 Memory cell based array of tuning circuit Jun. 26, 2012
7821362 Boosted-bias tunable filter with dynamic calibration Oct. 26, 2010
7777369 Apparatus, system and methods for enabling linearity improvement in voltage controlled variable capacitors Aug. 17, 2010
7646257 Method and apparatus to facilitate the provision and use of a plurality of varactors with a plurality of switches Jan. 12, 2010
7519342 Tunable tracking filter Apr. 14, 2009
7508279 Resonance circuit with variable diodes Mar. 24, 2009
7501919 Boosted-bias tunable filter with dynamic calibration Mar. 10, 2009
7436276 Tuning circuit preventing a deterioration of Q value Oct. 14, 2008
7427907 Boosted-bias tunable filter with dynamic calibration Sep. 23, 2008
7224241 Extended matching range tuner May. 29, 2007
6774737 High Q resonator circuit Aug. 10, 2004
6701779 Perpendicular torsion micro-electromechanical switch Mar. 9, 2004
6466114 Resonator with variable resonance frequency Oct. 15, 2002
6181218 High-linearity, low-spread variable capacitance array Jan. 30, 2001
5493715 Multi-range voltage controlled resonant circuit Feb. 20, 1996
4851798 Unitary tuning structure Jul. 25, 1989
4817193 AM transmitter having single tuning means for oscllator, carrier isolator and antenna Mar. 28, 1989
4760325 High frequency coil arrangement Jul. 26, 1988
4683447 Varactor tuning circuit for dielectric resonator stabilized oscillator Jul. 28, 1987
4564822 TV Tuner oscillator with feedback for more low frequency power Jan. 14, 1986
3970974 Trimmer for a tuned UHF line Jul. 20, 1976

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