Hamilton Standard Controls, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5085574 Fail-safe valve relay driver circuit for gas burnersExpiredOct 12, 89Feb 04, 92[F23N]
5041900 Semiconductor device having sealed electrical feedthroughExpiredJun 15, 89Aug 20, 91[G01L, H01G]
5017741 Rotary digital contact encoder substrateExpiredMar 29, 89May 21, 91[H01H, H05K]
5007159 Method of manufacturing an electrical component, e.g. a digital contacting encoderExpiredMar 29, 89Apr 16, 91[H01H]
5005123 Control system for microwave cooking applianceExpiredNov 19, 85Apr 02, 91[H05B]
4955806 Integrated furnace control having ignition switch diagnosticsExpiredMay 09, 89Sep 11, 90[F23N]
4947116 Inductive speed sensor employing phase shiftExpiredSep 02, 88Aug 07, 90[G01P]
4939455 Sensor having two-wire connection to loadExpiredSep 02, 88Jul 03, 90[G01P]
4927490 Method of manufacturing an electroluminescent displayExpiredMar 24, 89May 22, 90[C03C, C23F, B44C]
4894613 Inductive speed sensor having switching hysteresis for increasing the magnitude of a phase shiftExpiredSep 02, 88Jan 16, 90[G01P]
4874430 Composite silver base electrical contact materialExpiredJan 23, 89Oct 17, 89[C22C]
4872828 Integrated furnace control and control self testExpiredSep 10, 87Oct 10, 89[F23N]
4865538 Fail safe gas valve drive circuitExpiredSep 10, 87Sep 12, 89[H03K, F23N]
4849069 Method of producing filamentsExpiredDec 09, 87Jul 18, 89[H01L, C23F]
4849050 Method of producing a diaphragm on a substrateExpiredDec 09, 87Jul 18, 89[H01L]
4849071 Method of forming a sealed diaphragm on a substrateExpiredDec 09, 87Jul 18, 89[H01L]
4842510 Integrated furnace control having ignition and pressure switch diagnosticsExpiredSep 10, 87Jun 27, 89[F23N]
4839558 Integrated DC electroluminescent display systemExpiredMay 23, 88Jun 13, 89[H05B, G09G]
4834939 Composite silver base electrical contact materialExpiredMay 02, 88May 30, 89[G22F]
4832594 Control system with timer redundancyExpiredSep 10, 87May 23, 89[F23N]

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