US Patent Class 342
COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  RADIO WAVE ABSORBER {3}
5  DF  RADAR REFLECTOR {5}
13  DF  RADAR EW (ELECTRONIC WARFARE) {3}
21  DF  BASE BAND SYSTEM
22  DF  TRANSMISSION THROUGH MEDIA OTHER THAN AIR OR FREE SPACE
23  DF  BERTHING OR DOCKING
24  DF  BLIND AID
25  DF  SYNTHETIC APERTURE RADAR
26  DF  WEATHER RADAR
27  DF  PRESENCE DETECTION ONLY {1}
29  DF  AIRCRAFT COLLISION AVOIDANCE SYSTEM (CAS) {1}
33  DF  AIRCRAFT LANDING SYSTEM {2}
36  DF  AIR TRAFFIC CONTROL {1}
41  DF  SHIP COLLISION AVOIDANCE
42  DF  RADAR TRANSPONDER SYSTEM {6}
52  DF  COMBINED WITH DIVERSE TYPE RADIANT ENERGY SYSTEM {6}
59  DF  PLURAL RADAR
60  DF  TRANSMITTING INTELLIGENCE
61  DF  RETURN SIGNAL CONTROLS EXTERNAL DEVICE {7}
73  DF  RETURN SIGNAL CONTROLS RADAR SYSTEM {3}
104  DF  DETERMINING VELOCITY {9}
118  DF  DETERMINING DISTANCE {11}
147  DF  DETERMINING DIRECTION {6}
159  DF  CLUTTER ELIMINATION {1}
165  DF  TESTING OR CALIBRATING OF RADAR SYSTEM {5}
175  DF  WITH PARTICULAR CIRCUIT {13}
350  DF  DIRECTIVE {10}
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FOREIGN ART COLLECTIONS
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*  DF  DIRECTIVE {1}