SEABOARD-ARVAL CORPORATION, A CORP. OF TX

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4936382 Drive pipe adaptorExpiredMar 31, 89Jun 26, 90[E21B]
4886121 Universal flexbowl wellhead and well completion methodExpiredDec 05, 88Dec 12, 89[E21B]
4787642 X-shaped high pressure sealing structureExpiredApr 27, 87Nov 29, 88[F16J]
4774980 Piloted wellhead flow control valveExpiredFeb 06, 87Oct 04, 88[F16K]
4662603 Piloted wellhead flow control valveExpiredOct 03, 85May 05, 87[F16K]

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