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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4859934 Apparatus for measuring the frequency of microwave signalsExpiredOct 15, 87Aug 22, 89[G01R]
4839662 Composite waveguide coupling aperture having a varying thickness dimensionExpiredDec 01, 88Jun 13, 89[H01Q]
4775028 Method and system for depth soundingExpiredMar 05, 87Oct 04, 88[G01S, G01V]
4752781 Side-locking airborne radar (SLAR) antennaExpiredJan 15, 86Jun 21, 88[H01Q]
4484076 Direct reading dosimeterExpiredNov 13, 81Nov 20, 84[G01T]

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