US PATENT SUBCLASS 331 / 27
.~.~.~ Plural active element (e.g., triodes)

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}
27.~.~.~ Plural active element (e.g., triodes)

DEFINITION

Classification: 331/27

(under subclass 25) Subject matter wherein the signal of phase comparator includes two or more active elements (e.g., triodes) as elements thereof.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

89, for electric current or voltage measuring systems utilizing a phase comparator, a grid-controlled tube means constituting an element or elements thereof.