US PATENT SUBCLASS 340 / 870.26
.~ Frequency variation

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

870.01  DF  CONTINUOUSLY VARIABLE INDICATING (E.G., TELEMETERING) {15}
870.26.~ Frequency variation

DEFINITION

Classification: 340/870.26

Frequency variation:

(under subclass 870.01) Subject matter in which the intelligence is transmitted over the telemetry system by means of frequency change.

(1) Note. Frequency change or conversion is the process of converting a signal to some other frequency by combining it with another frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

870.18, for particular frequency modulation.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems, appropriate subclasses for frequency variation in voltage magnitude and phase control systems.

332, Modulators,

117+, for frequency modulation, per se. 455, Telecommunications,

110, for angle modulation in telecommunications.