US PATENT SUBCLASS 331 / 108 R
.~ Transistors

Current as of: June, 1999
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331 /   HD   OSCILLATORS

107 R  DF  SOLID STATE ACTIVE ELEMENT OSCILLATOR {6}
108 R.~ Transistors {11}
109  DF  .~.~> Amplitude stabilization and control
110  DF  .~.~> Bridge type
111  DF  .~.~> Relaxation oscillator {2}
114  DF  .~.~> Push-pull
115  DF  .~.~> Negative resistance
116 R  DF  .~.~> Electromechanical resonator controlled {2}
117 R  DF  .~.~> L-C type {2}
108 A  DF  .~.~> Use of complimentary-type transistors
108 B  DF  .~.~> Phase shift oscillator
108 C  DF  .~.~> Integrated circuit oscillators
108 D  DF  .~.~> Integrated modules with discrete elements oscillators

Unofficial Alpha Subclasses: R A B C D

DEFINITION

Classification: 331/108

(under subclass 107) Oscillators in which the active element consists of a device of electronic conducting, semi-conductive material utilizing the current amplification properties of the material, which device has three or more electrodes.

(1) Note. If an oscillator system involving an active solid state device or integrated circuit is claimed, nominally or in detail, then it is properly classified in Class 331, whereas if an oscillator system is not claimed or a subcombination thereof which involves an active solid state device is claimed, and is not elsewhere classifiable, then they are properly classified in Class 257.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses for active solid-state devices, including field effect or bipolar transistors, per se,

6, 8 for Gunn effect oscillators, and subclasses 446 and 499+ for integrated circuit devices with electrically isolated components.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous transistor or electron tube nonlinear circuits.

330, Amplifiers, 250+, for linear amplifiers systems utilizing transistors.