US PATENT SUBCLASS 342 / 129
.~.~ Plural frequencies transmitted

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

118  DF  DETERMINING DISTANCE {11}
128  DF  .~ With frequency modulation {3}
129.~.~ Plural frequencies transmitted

DEFINITION

Classification: 342/129

Plural frequency transmitted:

(under subclass 128) Subject matter including the transmission of two or more discrete frequency modulated radar carrier signals.