US PATENT SUBCLASS 342 / 38
.~.~ With altitude information


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

36  DF  AIR TRAFFIC CONTROL {1}
37  DF  .~ Secondary Surveilance Radar (SSR) or Air Traffic Control Radar Beacon System (ATCRBS) {3}
38.~.~ With altitude information


DEFINITION

Classification: 342/38

With altitude information:

(under subclass 37) Subject matter wherein the transponder signal includes information about the vertical distance of an aircraft or other object above a given reference plane such as the ground or sea.

SEE OR SEARCH THIS CLASS, SUBCLASS:

118+, for radar distance determination, per se.