US PATENT SUBCLASS 331 / 25
.~.~ Signal or phase comparator

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
18  DF  .~ With reference oscillator or source {5}
25.~.~ Signal or phase comparator {4}
26  DF  .~.~.~> Plural diode type
27  DF  .~.~.~> Plural active element (e.g., triodes)
28  DF  .~.~.~> Unilateral element (e.g., diode)
29  DF  .~.~.~> Electromechanical

DEFINITION

Classification: 331/25

(under subclass 18) Subject matter wherein a particular or significant signal or phase comparing network is utilized in the A.F.S. loop of the controlled oscillator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11, for single oscillator with plural A.F.S. means and including plural comparators.

32, for A.F.S. systems wherein the discriminator is of the single input type and wherein no signal comparison is made.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing, 76.52+, for systems for measuring the frequency of a cyclic current or voltage by phase comparison with a standard cyclic current or voltage, and subclasses 76.77+ for systems for measuring electricity utilizing phase comparison means (e.g., phase comparison between cyclic pulse voltage and sinusoidal current).

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

2+, for miscellaneous phase comparison circuits and subclasses 39+ for miscellaneous frequency comparing circuits.

329, Demodulators,

315+, for frequency demodulators and subclasses 345+ for phase demodulators.