Michigan Consolidated Gas Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D330233 Dinosaur figureExpiredOct 30, 90Oct 13, 92[]
5077016 Apparatus for producing gas-air concentrationsExpiredSep 16, 88Dec 31, 91[B01L]
4957273 Remote shut-off valveExpiredApr 25, 88Sep 18, 90[F16K]
4779839 System for actuating an electrical valve from a remote locationExpiredNov 28, 86Oct 25, 88[F16K]
4516269 Automatic equalization for a simulcast communication systemExpiredDec 10, 82May 07, 85[H04B]
4486148 Method of controlling a motive power and fluid driving systemExpiredMay 17, 82Dec 04, 84[F04B]
4469124 Gas shut-off valveExpiredJan 18, 82Sep 04, 84[F16K]
4437347 Shut-off actuating deviceExpiredJan 18, 82Mar 20, 84[G01F]
4330237 Compressor and engine efficiency system and methodExpiredOct 29, 79May 18, 82[F04B]
4287161 Method for defoaming in gas purification systemsExpiredMar 21, 80Sep 01, 81[B01D]
4263890 Flue restrictorExpiredSep 01, 78Apr 28, 81[F23L]

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