GSTC DEVELOPMENT CORPORATION

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Patent Activity in the Last 10 Years

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Top Patents (by citation)

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5242667 Solid pellet feeder for controlled melt replenishment in continuous crystal growing processJul 26, 91Sep 07, 93[C30G]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5746828 Temperature control system for growing high-purity monocrystalsExpiredJan 16, 96May 05, 98[C30B]
5059369 Refractory fiber module retainer systemExpiredMay 05, 86Oct 22, 91[C04B]
4949031 Environmental stress screening apparatus for electronic productsExpiredApr 05, 88Aug 14, 90[G01R]
4669191 Paper perforating deviceExpiredMay 06, 85Jun 02, 87[B26F]
4617450 Process for manufacture of a vacuum-moulded electrical heating unitExpiredMar 22, 83Oct 14, 86[H05B]
4575619 Electrical heating unit with serpentine heating elementExpiredMay 08, 84Mar 11, 86[H05B]
4531905 Optimizing combustion air flowExpiredSep 15, 83Jul 30, 85[F23N]
4493454 Cash collection receptacleExpiredSep 27, 82Jan 15, 85[G07B]
4474281 Apparatus and method for coin diameter computationExpiredJun 07, 82Oct 02, 84[G07D, G07F]
4460332 Temperature controlled oven with internal filterExpiredAug 27, 82Jul 17, 84[A21B]
4421976 System for monitoring heater elements of electric furnacesExpiredAug 26, 81Dec 20, 83[H05B]
4407312 Fare collection system and components thereofExpiredMay 28, 80Oct 04, 83[G07D]
4386973 Vacuum carburizing steelExpiredMay 08, 81Jun 07, 83[C21D]
4376442 Coin AssorterExpiredMay 14, 80Mar 15, 83[G07D]
4372478 Fare collection system and components thereofExpiredMay 14, 80Feb 08, 83[G07B]
4355003 Two pass endothermic generatorExpiredOct 07, 80Oct 19, 82[F28D]
4332552 Moldatherm insulated pacemaker furnace and method of manufactureExpiredOct 03, 80Jun 01, 82[F23M, F27B, F27D]
4300882 Industrial furnace with side wall ceramic insulating modulesExpiredJul 21, 80Nov 17, 81[F27D]
4278877 Electrical heating unit with flattened embedded heating coilExpiredAug 02, 79Jul 14, 81[H05B]

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