Gray Tool Company

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4700924 Pressure energized rotary hydraulic sealExpiredOct 06, 86Oct 20, 87[F16K, F15J]
4678209 Casing hangerExpiredOct 21, 85Jul 07, 87[F16L]
4643390 Fail-safe valve actuatorExpiredMay 29, 85Feb 17, 87[F16K]
4627958 Densification of metal powder to produce cladding of valve interiors by isodynamic compressionExpiredDec 27, 83Dec 09, 86[B22F]
4612983 Shear type gate valveExpiredOct 15, 85Sep 23, 86[E21B]
4607691 Non-orienting, multiple ported, cylindrical pressure transfer deviceExpiredJul 06, 84Aug 26, 86[E21B]
4570659 Fire resistant valveExpiredNov 01, 83Feb 18, 86[F16K]
4570724 Stepwise rotary actuatorExpiredAug 23, 84Feb 18, 86[F01B, F16H, E21B]
4569503 Valve with remote and manual actuation meansExpiredFeb 26, 85Feb 11, 86[F16K]
4562090 Method for improving the density, strength and bonding of coatingsExpiredNov 30, 83Dec 31, 85[B05D]
4556076 Fire resistant valveExpiredApr 18, 83Dec 03, 85[F16K]
4553589 Fire-safe surface-controlled subsurface safety valve control line/wellhead connector and blowout preventerExpiredJul 12, 84Nov 19, 85[E21B]
4552369 Stem sealing for high pressure valveExpiredDec 24, 84Nov 12, 85[F16K, F16J]
4545308 Apparatus for regulating airflow to a chemical recovery boilerExpiredAug 30, 84Oct 08, 85[F23L]
4540012 Temperature sensitive valve bonnet assemblyExpiredNov 01, 83Sep 10, 85[F16K]
4534235 Rotary stepper actuatorExpiredNov 01, 83Aug 13, 85[F16H]
4511002 Multiple tubing hanger tie back system and methodExpiredOct 21, 83Apr 16, 85[E21B]
4509594 Mudline casing hanger assemblyExpiredNov 29, 82Apr 09, 85[E21B]
4483545 Fire resistant connections and double ribbed sealing means thereforExpiredFeb 24, 83Nov 20, 84[F16J]
4477085 Fire resistant connections embodying heat transfer meansExpiredFeb 24, 83Oct 16, 84[F16J]

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