US PATENT SUBCLASS 331 / 28
.~.~.~ Unilateral element (e.g., diode)

Current as of: June, 1999
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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  DF  .~.~ Signal or phase comparator {4}
28.~.~.~ Unilateral element (e.g., diode)

DEFINITION

Classification: 331/28

(under subclass 25) Subject matter wherein the signal or phase comparator includes a unilaterally conducting element (e.g., diode, triode) as an element thereof.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

87+, for electric current or voltage measuring systems utilizing phase comparison means with nonlinear device (e.g., rectifier, grid controlled tube, etc.).