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Class Information
Number: 334/71
Name: Tuners > Variable inductor tuned
Description: Subject matter wherein a parallel tuned circuit consists of a capacitor of fixed capacitance value and a variable inductor, the inductance value of which may be varied over a given range in order to tune the the circuit over a range or band of frequencies.

Sub-classes under this class:

Class Number Class Name Patents
334/74 Adjustable core type 16
334/72 Movable contact adjustable over length of inductor 3

Patents under this class:

Patent Number Title Of Patent Date Issued
8598992 Self-calibrating RFID transponder Dec. 3, 2013
7583166 Inductor Q factor enhancement apparatus has bias circuit that is coupled to negative resistance generator for providing bias signal Sep. 1, 2009
7071799 High performance switch for switched inductor tuned RF circuit Jul. 4, 2006
6617947 Tuning circuit Sep. 9, 2003
6310527 Multi-layer circuit board including reactance element and a method of trimming a reactance element in a circuit board Oct. 30, 2001
6184755 Article comprising a variable inductor Feb. 6, 2001
5781088 Lumped-constant resonator structure and method for adjusting it Jul. 14, 1998
5715528 Converting capacitance to inductance in a floating resonant Feb. 3, 1998
4980663 Automated adjustment of air-core coil inductance Dec. 25, 1990
4851798 Unitary tuning structure Jul. 25, 1989
4752728 Tunable resonant sensing means to sense a particular frequency in a high energy charged particle beam and generate a frequency-domain signal in response Jun. 21, 1988
4511869 Radio circuit tuned by adjustably deforming an inductance coil Apr. 16, 1985
4485382 Tuning circuits with bendable U-shaped variable inductor for garage door actuators Nov. 27, 1984
4450588 Tuning system for a high frequency receiver utilizing a controllable inductor May. 22, 1984
4325040 Apparatus for automatic adjustment of an inductor in a tuned circuit Apr. 13, 1982
4048597 Planar printed circuit board arrangement useful in the UHF portion of a television tuner Sep. 13, 1977
3958196 Coil tuning apparatus May. 18, 1976

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