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.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →