Assignee
HYDRIL CO
247 granted patents·4 pending applications·12,295 citations·filing 1971–2025
Top patents by PatentIndex Score
251 records- 0198US6622797B2Apparatus and method to expand casingHYDRIL CO·Filed 2001·Granted Sep 23, 2003·131 cites·25 claims
- 0298US5655745ALow profile and lightweight high pressure blowout preventerHYDRIL CO·Filed 1996·Granted Aug 12, 1997·126 cites·6 claims
- 0398US4626135AMarine riser well control method and apparatusHYDRIL CO·Filed 1984·Granted Dec 2, 1986·260 cites·6 claims
- 0498US3989284ATubular connectionHYDRIL CO·Filed 1975·Granted Nov 2, 1976·184 cites·29 claims
- 0597USRE34467ETubular connectionHYDRIL CO·Filed 1992·Granted Dec 7, 1993·176 cites·4 claims
- 0697US4917409ATubular connectionHYDRIL CO·Filed 1988·Granted Apr 17, 1990·177 cites·7 claims
- 0797US4832126ADiverter system and blowout preventerHYDRIL CO·Filed 1986·Granted May 23, 1989·136 cites·9 claims
- 0897US4703954AThreaded pipe connection having wedge threadsHYDRIL CO·Filed 1985·Granted Nov 3, 1987·200 cites·4 claims
- 0996US6607220B2Radially expandable tubular connectionHYDRIL CO·Filed 2001·Granted Aug 19, 2003·185 cites·37 claims
- 1096US6325159B1Offshore drilling systemHYDRIL CO·Filed 1999·Granted Dec 4, 2001·250 cites·24 claims
- 1196US4444401AFlow diverter seal with respective oblong and circular openingsHYDRIL CO·Filed 1982·Granted Apr 24, 1984·95 cites·9 claims
- 1295US6102673ASubsea mud pump with reduced pulsationHYDRIL CO·Filed 1999·Granted Aug 15, 2000·250 cites·24 claims
- 1395US5430087ACarbon black pair with different particle size and improved rubber stockHYDRIL CO·Filed 1993·Granted Jul 4, 1995·91 cites·11 claims
- 1495US4828024ADiverter system and blowout preventerHYDRIL CO·Filed 1988·Granted May 9, 1989·90 cites·12 claims
- 1595US4681133ARotatable ball valve apparatus and methodHYDRIL CO·Filed 1983·Granted Jul 21, 1987·139 cites·47 claims
- 1695US4570982ATubular joint with trapped mid-joint metal-to-metal sealHYDRIL CO·Filed 1983·Granted Feb 18, 1986·113 cites·28 claims
- 1795US4502534AFlow diverterHYDRIL CO·Filed 1982·Granted Mar 5, 1985·145 cites·8 claims
- 1895US4444250AFlow diverterHYDRIL CO·Filed 1982·Granted Apr 24, 1984·188 cites·5 claims
- 1995US4373754AThreaded connectorHYDRIL CO·Filed 1981·Granted Feb 15, 1983·230 cites·20 claims
- 2095US4098341ARotating blowout preventer apparatusHYDRIL CO·Filed 1977·Granted Jul 4, 1978·153 cites·33 claims
- 2195US4076208ABlowout preventer ram lockHYDRIL CO·Filed 1976·Granted Feb 28, 1978·50 cites·40 claims
- 2294US4662659ATubular joint with trapped mid-joint metal-to-metal seal having unequal tapersHYDRIL CO·Filed 1986·Granted May 5, 1987·111 cites·7 claims
- 2394US4646844ADiverter/bop system and method for a bottom supported offshore drilling rigHYDRIL CO·Filed 1984·Granted Mar 3, 1987·136 cites·19 claims
- 2494US4026583AStainless steel liner in oil well pipeHYDRIL CO·Filed 1975·Granted May 31, 1977·190 cites·5 claims
- 2593US6505691B2Subsea mud pump and control systemHYDRIL CO·Filed 2001·Granted Jan 14, 2003·126 cites·35 claims
- 2693US6230824B1Rotating subsea diverterHYDRIL CO·Filed 1999·Granted May 15, 2001·253 cites·17 claims
- 2793US5320325APosition instrumented blowout preventerHYDRIL CO·Filed 1993·Granted Jun 14, 1994·119 cites·4 claims
- 2893US4537429ATubular connection with cylindrical and tapered stepped threadsHYDRIL CO·Filed 1983·Granted Aug 27, 1985·93 cites·12 claims
- 2993US4244607ACylindrical threaded connectionHYDRIL CO·Filed 1979·Granted Jan 13, 1981·75 cites·13 claims
- 3092US6361080B1Method for attaching an ANSI stub-end flanged connector to a composite tubular memberHYDRIL CO·Filed 2000·Granted Mar 26, 2002·53 cites·18 claims
- 3192US6270127B1Two-step, low torque wedge thread for tubular connectorHYDRIL CO·Filed 2000·Granted Aug 7, 2001·62 cites·16 claims
- 3292US5454605ATool joint connection with interlocking wedge threadsHYDRIL CO·Filed 1993·Granted Oct 3, 1995·159 cites·17 claims
- 3392US4703807ARotatable ball valve apparatus and methodHYDRIL CO·Filed 1986·Granted Nov 3, 1987·106 cites·11 claims
- 3492US4688832AWell pipe jointHYDRIL CO·Filed 1984·Granted Aug 25, 1987·125 cites·26 claims
- 3592US4646836ATertiary recovery method using inverted deviated holesHYDRIL CO·Filed 1984·Granted Mar 3, 1987·154 cites·7 claims
- 3692US3941348ASafety valveHYDRIL CO·Filed 1974·Granted Mar 2, 1976·91 cites·1 claims
- 3791US8029025B1Single taper wedge thread connection with mid-sealHYDRIL CO·Filed 2005·Granted Oct 4, 2011·30 cites·13 claims
- 3891US6158785AMulti-start wedge thread for tubular connectionHYDRIL CO·Filed 1998·Granted Dec 12, 2000·112 cites·35 claims
- 3991US5294253ACarbon black system and improved rubber stockHYDRIL CO·Filed 1993·Granted Mar 15, 1994·52 cites·13 claims
- 4091US4629224ATubular connectionHYDRIL CO·Filed 1985·Granted Dec 16, 1986·87 cites·7 claims
- 4191US4478287AWell control method and apparatusHYDRIL CO·Filed 1983·Granted Oct 23, 1984·107 cites·17 claims
- 4290US4597447ADiverter/bop system and method for a bottom supported offshore drilling rigHYDRIL CO·Filed 1984·Granted Jul 1, 1986·93 cites·48 claims
- 4389US11795981B2Threaded and coupled tubular goods connectionHYDRIL CO·Filed 2021·Granted Oct 24, 2023·2 cites·17 claims
- 4489US7850211B2Wedge thread connections having a clearance gap volumeHYDRIL CO·Filed 2007·Granted Dec 14, 2010·25 cites·5 claims
- 4589US7690696B2Wedge thread with torque shoulderHYDRIL CO·Filed 2001·Granted Apr 6, 2010·37 cites·10 claims
- 4689US4668126AFloating drilling rig apparatus and methodHYDRIL CO·Filed 1986·Granted May 26, 1987·91 cites·34 claims
- 4789US4592558ASpring ring and hat ring sealHYDRIL CO·Filed 1984·Granted Jun 3, 1986·142 cites·13 claims
- 4889US4572298AGate valve apparatus and methodHYDRIL CO·Filed 1983·Granted Feb 25, 1986·84 cites·44 claims
- 4989US4566494AVent line systemHYDRIL CO·Filed 1985·Granted Jan 28, 1986·89 cites·8 claims
- 5089US4496173AThreaded couplingHYDRIL CO·Filed 1983·Granted Jan 29, 1985·86 cites·34 claims
Showing the top 50 of 251 patent records by PatentIndex Score.
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →