Semiconductor Research Foundation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4641167 Semiconductor optoelectro transducerExpiredJul 29, 83Feb 03, 87[H01L]
4629901 Photo coupler with static induction transistor type detectorExpiredJul 29, 83Dec 16, 86[G02B]
4608587 Semiconductor optoelectro transducerExpiredJul 29, 83Aug 26, 86[H01L]
4540466 Method of fabricating semiconductor device by dry process utilizing photochemical reaction, and apparatus thereforExpiredApr 26, 84Sep 10, 85[H01L, B05D, C23F, B44C]
4525742 Two-dimensional solid-state image sensor deviceExpiredFeb 13, 84Jun 25, 85[H01N]
4506281 GaAs semiconductor deviceExpiredAug 24, 81Mar 19, 85[H01J]
4504865 Image signal readout methd for solid-state image sensorExpiredSep 16, 82Mar 12, 85[H01L]
4479845 Vapor growth with monitoringExpiredJun 14, 82Oct 30, 84[C30B]
4454526 Semiconductor image sensor and the method of operating the sameExpiredMay 20, 81Jun 12, 84[H01L]
4448525 Crystal defects analyzerExpiredJun 26, 81May 15, 84[G01N]
4408304 Semiconductor memoryExpiredMay 04, 81Oct 04, 83[G11C]
4377817 Semiconductor image sensorsExpiredMar 17, 80Mar 22, 83[H01L]
4333989 Sapphire single crystal substrate consisting essentially of Ga.sub.2 O.sub.3ExpiredFeb 22, 82Jun 08, 82[C30B]
4320410 GaAs Semiconductor deviceExpiredMay 03, 79Mar 16, 82[H01L]
4297718 Vertical type field effect transistorExpiredJun 08, 76Oct 27, 81[H01L]
4292373 Sapphire single crystal substrate for semiconductor devicesExpiredMay 19, 80Sep 29, 81[C04B, C30B]
4292374 Sapphire single crystal substrate for semiconductor devicesExpiredMay 19, 80Sep 29, 81[C30B]
4198645 Semiconductor controlled rectifier having gate grid dividing surrounding zone into two different impurity concentration sectionsExpiredApr 27, 78Apr 15, 80[H01L]

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