Assignee
CHRISTENSEN INC NORTON
US·37 granted patents·1,323 citations·filing 1980–1987
Top patents by PatentIndex Score
37 records- 0196US4904228AUniversal ball jointCHRISTENSEN INC NORTON·Filed 1984·Granted Feb 27, 1990·109 cites·26 claims
- 0293US4732225ADeep-borehole drilling device with magnetic couplingCHRISTENSEN INC NORTON·Filed 1987·Granted Mar 22, 1988·87 cites·8 claims
- 0388US4566545ACoring device with an improved core sleeve and anti-gripping collar with a collective core catcherCHRISTENSEN INC NORTON·Filed 1983·Granted Jan 28, 1986·167 cites·18 claims
- 0486US4635738ADrill bitCHRISTENSEN INC NORTON·Filed 1985·Granted Jan 13, 1987·125 cites·1 claims
- 0584US4498549ACutting member for rotary drill bitCHRISTENSEN INC NORTON·Filed 1982·Granted Feb 12, 1985·60 cites·2 claims
- 0680US4614232ADevice for delivering flowable materialCHRISTENSEN INC NORTON·Filed 1985·Granted Sep 30, 1986·41 cites·9 claims
- 0777US4606416ASelf activating, positively driven concealed core catcherCHRISTENSEN INC NORTON·Filed 1984·Granted Aug 19, 1986·50 cites·10 claims
- 0873US4607710ACammed and shrouded core catcherCHRISTENSEN INC NORTON·Filed 1984·Granted Aug 26, 1986·37 cites·14 claims
- 0973US4605075AShrouded core catcherCHRISTENSEN INC NORTON·Filed 1984·Granted Aug 12, 1986·41 cites·7 claims
- 1073US4567954AReplaceable nozzles for insertion into a drilling bit formed by powder metallurgical techniques and a method for manufacturing the sameCHRISTENSEN INC NORTON·Filed 1983·Granted Feb 4, 1986·53 cites·19 claims
- 1173US4497224AApparatus for making and breaking screw couplingsCHRISTENSEN INC NORTON·Filed 1983·Granted Feb 5, 1985·62 cites·4 claims
- 1272US4608226AMethod of forming a diamond tooth insert for a drill bit and a diamond cutting element formed therebyCHRISTENSEN INC NORTON·Filed 1984·Granted Aug 26, 1986·35 cites·11 claims
- 1372US4586574ACutter configuration for a gage-to-shoulder transition and face patternCHRISTENSEN INC NORTON·Filed 1983·Granted May 6, 1986·41 cites·22 claims
- 1464US4577704ABearing system for a downhole motorCHRISTENSEN INC NORTON·Filed 1980·Granted Mar 25, 1986·30 cites·4 claims
- 1562US4641289AProcess and device for transmitting information over a distanceCHRISTENSEN INC NORTON·Filed 1981·Granted Feb 3, 1987·28 cites·1 claims
- 1662US4519574AAuxiliary controlled valve disposed in a drilling stringCHRISTENSEN INC NORTON·Filed 1983·Granted May 28, 1985·36 cites·13 claims
- 1761US4580635AAutomatic drill pipe inside wiperCHRISTENSEN INC NORTON·Filed 1983·Granted Apr 8, 1986·26 cites·10 claims
- 1860US4552229AExternally powered core catcherCHRISTENSEN INC NORTON·Filed 1983·Granted Nov 12, 1985·25 cites·18 claims
- 1953US4553613AHydraulic lift inner barrel in a drill string coring toolCHRISTENSEN INC NORTON·Filed 1983·Granted Nov 19, 1985·19 cites·18 claims
- 2053US4515226ATooth design to avoid shearing stressesCHRISTENSEN INC NORTON·Filed 1983·Granted May 7, 1985·27 cites·12 claims
- 2150US4523765AHigh pressure sealing means for longitudinally movable parts of deep-well drilling toolsCHRISTENSEN INC NORTON·Filed 1984·Granted Jun 18, 1985·21 cites·7 claims
- 2249US4529047ACutting tooth and a rotating bit having a fully exposed polycrystalline diamond elementCHRISTENSEN INC NORTON·Filed 1983·Granted Jul 16, 1985·18 cites·22 claims
- 2348US4491188ADiamond cutting element in a rotating bitCHRISTENSEN INC NORTON·Filed 1983·Granted Jan 1, 1985·17 cites·15 claims
- 2447US4550790ADiamond rotating bitCHRISTENSEN INC NORTON·Filed 1983·Granted Nov 5, 1985·25 cites·15 claims
- 2544US4485880ADirect drive for deep-well drillingCHRISTENSEN INC NORTON·Filed 1983·Granted Dec 4, 1984·13 cites·9 claims
- 2643US4511007ALocking device for a tool with telescopically displaceable partsCHRISTENSEN INC NORTON·Filed 1983·Granted Apr 16, 1985·14 cites·15 claims
- 2742US4664205AHydraulic inner barrel in a drill string coring toolCHRISTENSEN INC NORTON·Filed 1985·Granted May 12, 1987·16 cites·19 claims
- 2839US4603749AApparatus for downward displacement of an inner tube within a coring barrelCHRISTENSEN INC NORTON·Filed 1984·Granted Aug 5, 1986·10 cites·6 claims
- 2939US4573539AHydraulically pulsed indexing system for sleeve-type core barrelsCHRISTENSEN INC NORTON·Filed 1983·Granted Mar 4, 1986·14 cites·16 claims
- 3039US4558749AAnti-jamming core barrelsCHRISTENSEN INC NORTON·Filed 1983·Granted Dec 17, 1985·14 cites·19 claims
- 3137US4553614ACompensation device for insertion in a drill string for deep-well drilling toolsCHRISTENSEN INC NORTON·Filed 1984·Granted Nov 19, 1985·7 cites·5 claims
- 3236US4629013ADrive device for a drill bitCHRISTENSEN INC NORTON·Filed 1985·Granted Dec 16, 1986·8 cites·12 claims
- 3336US4580643AAdjustable bearing section core barrelCHRISTENSEN INC NORTON·Filed 1984·Granted Apr 8, 1986·13 cites·15 claims
- 3433US4552231ARotating pilot core bit for use in highly fractured formationsCHRISTENSEN INC NORTON·Filed 1983·Granted Nov 12, 1985·11 cites·3 claims
- 3531US4527642AEarth-boring drill bit with rectangular nozzlesCHRISTENSEN INC NORTON·Filed 1982·Granted Jul 9, 1985·11 cites·5 claims
- 3631US4482013AMechanical wireline borehole packerCHRISTENSEN INC NORTON·Filed 1983·Granted Nov 13, 1984·10 cites·9 claims
- 3712US4643265ACore barrel apparatus for disposing a core within a thin, flexible film casingCHRISTENSEN INC NORTON·Filed 1985·Granted Feb 17, 1987·2 cites·2 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →