OTIS ENGINEERING CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5259457 Safety valve, sealing ring and seal assemblyExpiredOct 27, 92Nov 09, 93[E21B]
5044888 Variable speed pump control for maintaining fluid level below full barrel levelExpiredFeb 10, 89Sep 03, 91[F04B]
H000945 Connecting apparatus for two tubular membersExpiredOct 01, 90Aug 06, 91[F16L]
5018703 Valve design to reduce cavitation and noiseExpiredJun 26, 89May 28, 91[F16K]
5002130 System for handling reeled tubingExpiredJan 29, 90Mar 26, 91[E21B]
4976402 Manual blowout preventer with invertible ramsExpiredMay 21, 90Dec 11, 90[E21B]
4962813 Well tool locking system for staggered boreExpiredFeb 28, 89Oct 16, 90[E21B]
4913228 Dual string tension-set, tension-release well packerExpiredApr 01, 86Apr 03, 90[E21B]
4898239 Retrievable bridge plugExpiredFeb 23, 89Feb 06, 90[E21B]
4880060 Valve control systemExpiredAug 31, 88Nov 14, 89[E21B]
4846270 Trash barrier tool for wellsExpiredApr 07, 88Jul 11, 89[F16L, E21B]
4846281 Dual flapper valve assemblyExpiredJul 21, 88Jul 11, 89[E21B]
4844160 Parking mandrelExpiredMar 14, 88Jul 04, 89[E21B]
4842074 Gas storage well safety system and methodExpiredOct 15, 87Jun 27, 89[E21B]
4840229 Multiple position service seal unit with positive position indicating meansExpiredSep 18, 87Jun 20, 89[E21B]
4821799 Grease injection control systemExpiredMay 10, 88Apr 18, 89[E21B, F16J]
4796698 Landing nipple and plugExpiredMay 07, 87Jan 10, 89[E21B]
4776401 Foot valve for pumping wellsExpiredAug 17, 87Oct 11, 88[F04B, E21B]
4766960 Standing and injection valveExpiredJul 24, 87Aug 30, 88[E21B]
4767145 Running and pulling toolExpiredOct 06, 86Aug 30, 88[E21B]

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