Richard Hirschmann Radiotechnisches Werk

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5234221 Elastomer sealExpiredFeb 22, 90Aug 10, 93[F16J]
4853690 Security alarm process and apparatusExpiredApr 01, 87Aug 01, 89[G08B]
4827133 Infrared space surveillance detector circuitExpiredOct 20, 86May 02, 89[G01J]
4806854 Current draw and power consumption display circuitExpiredSep 23, 86Feb 21, 89[G01R]
4795905 Circuit layout for an infrared room surveillance detectorExpiredAug 11, 86Jan 03, 89[G01J]
4771219 Light emitting diode control circuitExpiredJun 02, 86Sep 13, 88[B05C]
4702449 Cardan ball suspension for motion sensorExpiredApr 23, 86Oct 27, 87[E04G]
4670655 Alarm apparatus for spatial surveillanceExpiredJul 01, 85Jun 02, 87[G01J]
4645930 Motion detectorExpiredDec 24, 84Feb 24, 87[G01J]
4625113 Motion detector having sensing means which determine the shape of the field of sensitivityExpiredFeb 28, 85Nov 25, 86[G01P]
4529874 Motion detector for space surveillanceExpiredNov 16, 84Jul 16, 85[G08B]
4479056 Motion detector for space surveillanceExpiredMay 17, 82Oct 23, 84[G01J]
4424515 Assembly for mounting antenna on vehicle bodyExpiredJul 27, 81Jan 03, 84[H01Q]
4386817 Cable underpinningExpiredDec 22, 80Jun 07, 83[H01R]
4338552 Automatic control system for d-c motorExpiredMay 28, 80Jul 06, 82[H02P]
4287510 Electronic signal generator with periodically varying frequencyExpiredDec 03, 79Sep 01, 81[G08B]
4254505 Normalization method and apparatus used when quantitatively measuring the reception quality of a received frequency-modulated ultrashort-wave signalExpiredApr 10, 79Mar 03, 81[H04B]
4216429 Method and apparatus for quantitatively measuring the reception quality of a received frequency-modulated ultrashort-wave signalExpiredApr 10, 79Aug 05, 80[H04B]

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