US PATENT SUBCLASS 331 / 177 R
WITH FREQUENCY ADJUSTING MEANS

Current as of: June, 1999
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331 /   HD   OSCILLATORS

177 RWITH FREQUENCY ADJUSTING MEANS {5}
178  DF  .~> Cyclic frequency sweeping means (e.g., vibrato)
179  DF  .~> Step-frequency change (e.g., band selection, frequency-shift keying)
180  DF  .~> Reactance tube type
181  DF  .~> Variable inductance device (e.g., saturable core or adjustable vane inductor)
177 V  DF  .~> With voltage sensitive capacitor

Unofficial Alpha Subclasses: R V

DEFINITION

Classification: 331/177

(under the class definition) Oscillators having means for setting or controlling the frequency of the generated wave oscillator by varying a frequency determining element or elements of the oscillator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

16, for automatic frequency stabilized oscillators with means to compensate or correct for undesired affects when tuning the oscillator over a range of frequencies.

34, for automatic frequency stabilized oscillators with particular tuning or frequency adjusting means.

40, for beat frequency oscillator systems with frequency control means.

48, for plural oscillator systems with frequency adjusting means for at least one oscillator. 90, for magnetron type oscillators with frequency adjustment means.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

235+, for tunable distributed parameter resonators.

334, Tuners, appropriate subclasses for tuned networks for use in wave energy apparatus and comprising inductance and capacitance elements in circuit arrangement to form a resonant circuit and in which structure is provided for adjusting one or both of these elements for changing the means resonant frequency of the circuit.

455, Telecommunications,

196.1+, for radio receivers with tunable heterodyning oscillator.