BOWEN TOOLS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5388651 Top drive unit torque break-out systemExpiredApr 20, 93Feb 14, 95[E21B]
5163513 Circle threadform for marine riser top jointExpiredJun 28, 91Nov 17, 92[E21B]
4877217 Fail-safe blowout preventerExpiredOct 27, 88Oct 31, 89[F16K]
4842058 Load detection and indicator apparatus for well tubing or the likeExpiredSep 26, 88Jun 27, 89[E21B]
4715456 Slips for well pipeExpiredFeb 24, 86Dec 29, 87[E21B]
4706745 Lock-down releasing spear assemblyExpiredDec 15, 86Nov 17, 87[E21B]
4456215 Inner seal and support rod assembly for high pressure blowout preventersExpiredMay 07, 82Jun 26, 84[E21B]
4398729 Blowout preventer inner ram seal assemblyExpiredDec 20, 82Aug 16, 83[E21B, F16J]
4387885 Shock absorber assembly for absorbing shocks encountered by a drill stringExpiredMay 07, 82Jun 14, 83[F16F, E21B]

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