General Screw Products Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4672728 Pressure signal instrumentation having removable flanges and mounting method thereforExpiredFeb 26, 86Jun 16, 87[F16L, B21D]
4655251 Valve having hard and soft seatsExpiredAug 25, 86Apr 07, 87[F16K, F16L]
4630629 Valve with compressible valve stem and valve body sealsExpiredMar 07, 86Dec 23, 86[F16K]
4597581 Pressure seal for valve stems and the likeExpiredApr 30, 85Jul 01, 86[F16K, F16J]
4582089 Valve manifold having a removable flangeExpiredOct 31, 84Apr 15, 86[F16L]
4556196 Method and apparatus for sealing valve stemsExpiredDec 21, 83Dec 03, 85[F16K, F16J]
4512441 Blowdown fittingExpiredJun 28, 82Apr 23, 85[F16N, F01M]
4347915 Grease fittingExpiredFeb 25, 80Sep 07, 82[F16N]

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