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Class Information
Number: 455/261
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Local control of receiver operation > Local oscillator frequency control > Automatic > Utilizing particular local oscillator control > Variable reactance (e.g., reactance tube)
Description: Systems wherein the control means comprises variable reactance means. The variable reactance means may consist of a reactance tube or a solid-state type variable reactance means, e.g., in the oscillator circuit, the reactance of which is a function of applied bias voltage.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7512389 |
Active inductors using bipolar silicon transistors |
Mar. 31, 2009 |
| 7274919 |
Radiofrequency transmitter and/or receiver |
Sep. 25, 2007 |
| 6968168 |
Variable oscillator |
Nov. 22, 2005 |
| 6593826 |
Wireless phone system with voltage controlled oscillator |
Jul. 15, 2003 |
| 5020146 |
Lossy constant bandwidth tuned circuit |
May. 28, 1991 |
| 4736458 |
Receiver provided with an automatic frequency control loop |
Apr. 5, 1988 |
| 4569085 |
Oscillator control circuit in an F.M. receiver |
Feb. 4, 1986 |
| 4450588 |
Tuning system for a high frequency receiver utilizing a controllable inductor |
May. 22, 1984 |
| 4321624 |
AFT Circuit |
Mar. 23, 1982 |
| 4271533 |
AFC Interface circuit |
Jun. 2, 1981 |
| 4266295 |
Continuous tuning control particularly adapted for use in variable frequency receivers and generators |
May. 5, 1981 |
| 4200841 |
Preset tuning apparatus using floating gate type field effect device |
Apr. 29, 1980 |
| 3987399 |
Radio receiver |
Oct. 19, 1976 |
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