Assignee
HUGHES TOOL CO
US·326 granted patents·12,478 citations·filing 1974–1992
Top patents by PatentIndex Score
326 records- 0197US4793422AArticulated elevator links for top drive drill rigHUGHES TOOL CO·Filed 1988·Granted Dec 27, 1988·171 cites·4 claims
- 0297US4726432ADifferentially hardfaced rock bitHUGHES TOOL CO·Filed 1987·Granted Feb 23, 1988·138 cites·8 claims
- 0397US4445734ATelemetry drill pipe with pressure sensitive contactsHUGHES TOOL CO·Filed 1981·Granted May 1, 1984·206 cites·8 claims
- 0496US4884071AWellbore tool with hall effect couplingHUGHES TOOL CO·Filed 1988·Granted Nov 28, 1989·196 cites·10 claims
- 0596US4788544AWell bore data transmission systemHUGHES TOOL CO·Filed 1987·Granted Nov 29, 1988·276 cites·10 claims
- 0696US4519456AContinuous flow perforation washing tool and methodHUGHES TOOL CO·Filed 1984·Granted May 28, 1985·175 cites·8 claims
- 0795US4727942ACompensator for earth boring bitsHUGHES TOOL CO·Filed 1986·Granted Mar 1, 1988·149 cites·12 claims
- 0895US4678404ALow volume variable rpm submersible well pumpHUGHES TOOL CO·Filed 1986·Granted Jul 7, 1987·138 cites·5 claims
- 0995US4676725AMoineau type gear mechanism with resilient sleeveHUGHES TOOL CO·Filed 1985·Granted Jun 30, 1987·57 cites·8 claims
- 1095US4667756AMatrix bit with extended bladesHUGHES TOOL CO·Filed 1986·Granted May 26, 1987·155 cites·5 claims
- 1195US4554981ATubing pressurized firing apparatus for a tubing conveyed perforating gunHUGHES TOOL CO·Filed 1985·Granted Nov 26, 1985·103 cites·23 claims
- 1295US4506432AMethod of connecting joints of drill pipeHUGHES TOOL CO·Filed 1983·Granted Mar 26, 1985·97 cites·3 claims
- 1394US4914433AConductor system for well bore data transmissionHUGHES TOOL CO·Filed 1988·Granted Apr 3, 1990·147 cites·9 claims
- 1494US4698631ASurface acoustic wave pipe identification systemHUGHES TOOL CO·Filed 1986·Granted Oct 6, 1987·204 cites·6 claims
- 1594US4574895ASolid head bit with tungsten carbide central coreHUGHES TOOL CO·Filed 1983·Granted Mar 11, 1986·139 cites·4 claims
- 1693US4521708AMotor bearing with locking pinsHUGHES TOOL CO·Filed 1984·Granted Jun 4, 1985·51 cites·4 claims
- 1793US4336840ADouble cylinder systemHUGHES TOOL CO·Filed 1980·Granted Jun 29, 1982·110 cites·2 claims
- 1892US4667752ATop head drive well drilling apparatus with stabbing guideHUGHES TOOL CO·Filed 1986·Granted May 26, 1987·115 cites·10 claims
- 1992US4632186AWell cementing method using an AM/AMPS fluid loss additive blendHUGHES TOOL CO·Filed 1985·Granted Dec 30, 1986·82 cites·4 claims
- 2092US4602691ADiamond drill bit with varied cutting elementsHUGHES TOOL CO·Filed 1984·Granted Jul 29, 1986·103 cites·4 claims
- 2192US4465104APressure energized pipeline plugHUGHES TOOL CO·Filed 1983·Granted Aug 14, 1984·92 cites·13 claims
- 2292US4421999ASubmersible pump seal section with multiple bellowsHUGHES TOOL CO·Filed 1981·Granted Dec 20, 1983·86 cites·10 claims
- 2392US3989554AComposite hardfacing of air hardening steel and particles of tungsten carbideHUGHES TOOL CO·Filed 1975·Granted Nov 2, 1976·79 cites·8 claims
- 2491US4636151ADownhole progressive cavity type drilling motor with flexible connecting rodHUGHES TOOL CO·Filed 1985·Granted Jan 13, 1987·43 cites·5 claims
- 2591US4569394AMethod and apparatus for increasing the concentration of proppant in well stimulation techniquesHUGHES TOOL CO·Filed 1984·Granted Feb 11, 1986·118 cites·13 claims
- 2691US4422477APressure energized pipeline plugHUGHES TOOL CO·Filed 1981·Granted Dec 27, 1983·87 cites·14 claims
- 2790US4548431ATool joint with internal/external make-up shouldersHUGHES TOOL CO·Filed 1984·Granted Oct 22, 1985·89 cites·2 claims
- 2890US4440233ASetting toolHUGHES TOOL CO·Filed 1982·Granted Apr 3, 1984·135 cites·9 claims
- 2990US4386667APlunger lubricant compensator for an earth boring drill bitHUGHES TOOL CO·Filed 1980·Granted Jun 7, 1983·54 cites·5 claims
- 3090US4370518ASplice for lead-coated and insulated conductorsHUGHES TOOL CO·Filed 1981·Granted Jan 25, 1983·61 cites·8 claims
- 3189US4759239AWrench assembly for a top drive subHUGHES TOOL CO·Filed 1987·Granted Jul 26, 1988·124 cites·1 claims
- 3289US4665979AMetal casing hanger seal with expansion slotsHUGHES TOOL CO·Filed 1985·Granted May 19, 1987·97 cites·7 claims
- 3389US4569395AMatrix control cementing slurryHUGHES TOOL CO·Filed 1984·Granted Feb 11, 1986·44 cites·6 claims
- 3489US4514309ACross-linking system for water based well fracturing fluidsHUGHES TOOL CO·Filed 1982·Granted Apr 30, 1985·191 cites·4 claims
- 3589US4375240AWell packerHUGHES TOOL CO·Filed 1980·Granted Mar 1, 1983·93 cites·9 claims
- 3689US4243727ASurface smoothed tool joint hardfacingHUGHES TOOL CO·Filed 1977·Granted Jan 6, 1981·72 cites·5 claims
- 3789US4211508AEarth boring tool with improved insertsHUGHES TOOL CO·Filed 1976·Granted Jul 8, 1980·41 cites·2 claims
- 3888US5038640ATitanium carbide modified hardfacing for use on bearing surfaces of earth boring bitsHUGHES TOOL CO·Filed 1990·Granted Aug 13, 1991·59 cites·8 claims
- 3988US4953641ATwo cone bit with non-opposite conesHUGHES TOOL CO·Filed 1989·Granted Sep 4, 1990·68 cites·6 claims
- 4088US4516641AEarth boring bit with pressure compensating rigid face sealHUGHES TOOL CO·Filed 1983·Granted May 14, 1985·84 cites·12 claims
- 4188US4512405APneumatic transfer of solids into wellsHUGHES TOOL CO·Filed 1984·Granted Apr 23, 1985·61 cites·17 claims
- 4288US4491177ABall dropping assemblyHUGHES TOOL CO·Filed 1982·Granted Jan 1, 1985·46 cites·2 claims
- 4388US4482379ACold set cement composition and methodHUGHES TOOL CO·Filed 1983·Granted Nov 13, 1984·77 cites·12 claims
- 4488US4469172ASelf-energizing locking mechanismHUGHES TOOL CO·Filed 1983·Granted Sep 4, 1984·81 cites·7 claims
- 4588US4403658AMultiline riser support and connection system and method for subsea wellsHUGHES TOOL CO·Filed 1980·Granted Sep 13, 1983·76 cites·15 claims
- 4687US4753304AVolume and pressure balanced rigid face seal for rock bitsHUGHES TOOL CO·Filed 1987·Granted Jun 28, 1988·48 cites·4 claims
- 4787US4711326ASlip gripping mechanismHUGHES TOOL CO·Filed 1986·Granted Dec 8, 1987·107 cites·9 claims
- 4886US4984643AAnti-balling earth boring bitHUGHES TOOL CO·Filed 1990·Granted Jan 15, 1991·97 cites·10 claims
- 4986US4583923ABellows latching mechanism for a submersible pumpHUGHES TOOL CO·Filed 1984·Granted Apr 22, 1986·45 cites·5 claims
- 5086US4581613ASubmersible pump telemetry systemHUGHES TOOL CO·Filed 1982·Granted Apr 8, 1986·63 cites·7 claims
Showing the top 50 of 326 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when HUGHES TOOL CO files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →