Assignee
OTIS ENG CO
461 granted patents·19,837 citations·filing 1972–1992
Top patents by PatentIndex Score
461 records- 0197US4306628ASafety switch for well toolsOTIS ENG CO·Filed 1980·Granted Dec 22, 1981·100 cites·26 claims
- 0297US4288082AWell sealing systemOTIS ENG CO·Filed 1980·Granted Sep 8, 1981·209 cites·17 claims
- 0397US4181149AQuick disconnect rotary valve couplingOTIS ENG CO·Filed 1977·Granted Jan 1, 1980·92 cites·27 claims
- 0496US5176164AFlow control valve systemOTIS ENG CO·Filed 1989·Granted Jan 5, 1993·178 cites·11 claims
- 0596US4473245APipe jointOTIS ENG CO·Filed 1982·Granted Sep 25, 1984·138 cites·1 claims
- 0696US4425965ASafety system for submersible pumpOTIS ENG CO·Filed 1982·Granted Jan 17, 1984·174 cites·12 claims
- 0795US5172717AWell control systemOTIS ENG CO·Filed 1990·Granted Dec 22, 1992·227 cites·46 claims
- 0895US4636934AWell valve control systemOTIS ENG CO·Filed 1984·Granted Jan 13, 1987·177 cites·23 claims
- 0995US4436150ABridge plugOTIS ENG CO·Filed 1981·Granted Mar 13, 1984·136 cites·29 claims
- 1095US4311194ALiner hanger and running and setting toolOTIS ENG CO·Filed 1979·Granted Jan 19, 1982·123 cites·18 claims
- 1194US4753444ASeal and seal assembly for well toolsOTIS ENG CO·Filed 1986·Granted Jun 28, 1988·139 cites·20 claims
- 1294US4457369APacker for high temperature high pressure wellsOTIS ENG CO·Filed 1980·Granted Jul 3, 1984·130 cites·17 claims
- 1394US4429747AWell toolOTIS ENG CO·Filed 1981·Granted Feb 7, 1984·122 cites·9 claims
- 1494US4248302AMethod and apparatus for recovering viscous petroleum from tar sandOTIS ENG CO·Filed 1979·Granted Feb 3, 1981·114 cites·13 claims
- 1594US4180132AService seal unit for well packerOTIS ENG CO·Filed 1978·Granted Dec 25, 1979·104 cites·6 claims
- 1693US4981173AElectric surface controlled subsurface valve systemOTIS ENG CO·Filed 1989·Granted Jan 1, 1991·119 cites·28 claims
- 1793US4945938AReels and carriers thereforOTIS ENG CO·Filed 1989·Granted Aug 7, 1990·80 cites·14 claims
- 1893US4919204AApparatus and methods for cleaning a wellOTIS ENG CO·Filed 1989·Granted Apr 24, 1990·164 cites·14 claims
- 1993US4730677AMethod and system for maintenance and servicing of subsea wellsOTIS ENG CO·Filed 1986·Granted Mar 15, 1988·165 cites·28 claims
- 2093US4709761AWell conduit joint sealing systemOTIS ENG CO·Filed 1986·Granted Dec 1, 1987·74 cites·16 claims
- 2193US4624315ASubsurface safety valve with lock-open systemOTIS ENG CO·Filed 1984·Granted Nov 25, 1986·115 cites·19 claims
- 2293US4396061ALocking mandrel for a well flow conductorOTIS ENG CO·Filed 1981·Granted Aug 2, 1983·128 cites·7 claims
- 2393US4160478AWell toolsOTIS ENG CO·Filed 1978·Granted Jul 10, 1979·105 cites·19 claims
- 2492US5211241AVariable flow sliding sleeve valve and positioning shifting tool thereforOTIS ENG CO·Filed 1991·Granted May 18, 1993·162 cites·16 claims
- 2592US5188182ASystem containing expendible isolation valve with frangible sealing member, seat arrangement and method for useOTIS ENG CO·Filed 1991·Granted Feb 23, 1993·162 cites·29 claims
- 2692US4921438AWet connectorOTIS ENG CO·Filed 1989·Granted May 1, 1990·113 cites·20 claims
- 2792US4655291AInjector for coupled pipeOTIS ENG CO·Filed 1985·Granted Apr 7, 1987·115 cites·33 claims
- 2892US4633954AWell production controller systemOTIS ENG CO·Filed 1983·Granted Jan 6, 1987·118 cites·40 claims
- 2992US4515220AApparatus and method for rotating coil tubing in a wellOTIS ENG CO·Filed 1983·Granted May 7, 1985·104 cites·39 claims
- 3092US4291722ADrill string safety and kill valveOTIS ENG CO·Filed 1979·Granted Sep 29, 1981·97 cites·17 claims
- 3192US4161782AMicroprocessor computerized pressure/temperature/time down-hole recorderOTIS ENG CO·Filed 1977·Granted Jul 17, 1979·104 cites·21 claims
- 3291US5004049ALow profile dual screen prepackOTIS ENG CO·Filed 1990·Granted Apr 2, 1991·152 cites·11 claims
- 3391US4702320AMethod and system for attaching and removing equipment from a wellheadOTIS ENG CO·Filed 1986·Granted Oct 27, 1987·111 cites·36 claims
- 3491US4494608AWell injection systemOTIS ENG CO·Filed 1982·Granted Jan 22, 1985·58 cites·23 claims
- 3591US4399871AChemical injection valve with openable bypassOTIS ENG CO·Filed 1981·Granted Aug 23, 1983·123 cites·27 claims
- 3690US5191173AElectrical cable in reeled tubingOTIS ENG CO·Filed 1991·Granted Mar 2, 1993·104 cites·4 claims
- 3790US4913239ASubmersible well pump and well completion systemOTIS ENG CO·Filed 1989·Granted Apr 3, 1990·89 cites·10 claims
- 3890US4813481AExpendable flapper valveOTIS ENG CO·Filed 1987·Granted Mar 21, 1989·113 cites·11 claims
- 3990US4685522AWell production controller systemOTIS ENG CO·Filed 1986·Granted Aug 11, 1987·106 cites·28 claims
- 4090US4576254AHydraulically actuated slip assemblyOTIS ENG CO·Filed 1984·Granted Mar 18, 1986·55 cites·18 claims
- 4190US4458925APipe jointOTIS ENG CO·Filed 1983·Granted Jul 10, 1984·71 cites·6 claims
- 4290US4276482ALine flow electric power generatorOTIS ENG CO·Filed 1979·Granted Jun 30, 1981·78 cites·4 claims
- 4390US4214605AActuator for wireline blowout preventerOTIS ENG CO·Filed 1978·Granted Jul 29, 1980·58 cites·8 claims
- 4490US4154298AWell tubing hangerOTIS ENG CO·Filed 1977·Granted May 15, 1979·53 cites·5 claims
- 4590US4077472AWell flow control system and methodOTIS ENG CO·Filed 1976·Granted Mar 7, 1978·52 cites·31 claims
- 4690US3994516ATelescoping pipe coupling with improved pressure seal connection threadsOTIS ENG CO·Filed 1975·Granted Nov 30, 1976·75 cites·9 claims
- 4789US5293551AMonitor and control circuit for electric surface controlled subsurface valve systemOTIS ENG CO·Filed 1992·Granted Mar 8, 1994·127 cites·29 claims
- 4889US5107441ASystem for evaluating the flow performance characteristics of a deviceOTIS ENG CO·Filed 1990·Granted Apr 21, 1992·79 cites·34 claims
- 4989US4930573ADual hydraulic set packerOTIS ENG CO·Filed 1989·Granted Jun 5, 1990·114 cites·13 claims
- 5089US4834175AHydraulic versa-trieve packerOTIS ENG CO·Filed 1988·Granted May 30, 1989·89 cites·12 claims
Showing the top 50 of 461 patent records by PatentIndex Score.
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