Assignee
CHRISTENSEN INC
48 granted patents·3,119 citations·filing 1976–1983
Top patents by PatentIndex Score
48 records- 0198US4373593ADrill bitCHRISTENSEN INC·Filed 1980·Granted Feb 15, 1983·212 cites·12 claims
- 0298US4186569ADual spring drill string shock absorberCHRISTENSEN INC·Filed 1978·Granted Feb 5, 1980·80 cites·29 claims
- 0397US4429741ASelf powered downhole tool anchorCHRISTENSEN INC·Filed 1981·Granted Feb 7, 1984·266 cites·10 claims
- 0497US4351401AEarth-boring drill bitsCHRISTENSEN INC·Filed 1980·Granted Sep 28, 1982·216 cites·6 claims
- 0593US4200159ACutter head, drill bit and similar drilling toolsCHRISTENSEN INC·Filed 1977·Granted Apr 29, 1980·195 cites·23 claims
- 0692US4460053ADrill tool for deep wellsCHRISTENSEN INC·Filed 1981·Granted Jul 17, 1984·117 cites·12 claims
- 0792US4073354AEarth-boring drill bitsCHRISTENSEN INC·Filed 1976·Granted Feb 14, 1978·106 cites·32 claims
- 0891US4471845ARotary drill bitCHRISTENSEN INC·Filed 1982·Granted Sep 18, 1984·92 cites·13 claims
- 0991US4266621AWell casing window millCHRISTENSEN INC·Filed 1978·Granted May 12, 1981·112 cites·40 claims
- 1089US4133516AShock absorber for well drilling pipeCHRISTENSEN INC·Filed 1977·Granted Jan 9, 1979·72 cites·34 claims
- 1188US4244432AEarth-boring drill bitsCHRISTENSEN INC·Filed 1978·Granted Jan 13, 1981·71 cites·15 claims
- 1288US4234048ADrill bits embodying impregnated segmentsCHRISTENSEN INC·Filed 1978·Granted Nov 18, 1980·62 cites·25 claims
- 1388US4092881AApparatus for making-up and breaking threaded pipe connectionsCHRISTENSEN INC·Filed 1976·Granted Jun 6, 1978·66 cites·18 claims
- 1487US4098363ADiamond drilling bit for soft and medium hard formationsCHRISTENSEN INC·Filed 1977·Granted Jul 4, 1978·71 cites·15 claims
- 1586US4512426ARotating bits including a plurality of types of preferential cutting elementsCHRISTENSEN INC·Filed 1983·Granted Apr 23, 1985·90 cites·23 claims
- 1685US4499959ATooth configuration for an earth boring bitCHRISTENSEN INC·Filed 1983·Granted Feb 19, 1985·84 cites·13 claims
- 1784US4352400ADrill bitCHRISTENSEN INC·Filed 1980·Granted Oct 5, 1982·86 cites·11 claims
- 1883US4452324ARotary drill bitCHRISTENSEN INC·Filed 1981·Granted Jun 5, 1984·60 cites·1 claims
- 1982US4515227ANozzle placement in a diamond rotating bit including a pilot bitCHRISTENSEN INC·Filed 1983·Granted May 7, 1985·63 cites·6 claims
- 2082US4415823AGenerator for the production of electrical energyCHRISTENSEN INC·Filed 1981·Granted Nov 15, 1983·56 cites·9 claims
- 2182US4187061ARotary helical fluid motor with deformable sleeve for deep drilling toolCHRISTENSEN INC·Filed 1978·Granted Feb 5, 1980·48 cites·17 claims
- 2281US4194582ADouble acting shock absorbers for drill stringsCHRISTENSEN INC·Filed 1978·Granted Mar 25, 1980·50 cites·14 claims
- 2379US4391328ADrill string safety valveCHRISTENSEN INC·Filed 1981·Granted Jul 5, 1983·53 cites·6 claims
- 2479US4256192APressure core barrelCHRISTENSEN INC·Filed 1979·Granted Mar 17, 1981·43 cites·8 claims
- 2578US4415316ADown hole motorCHRISTENSEN INC·Filed 1981·Granted Nov 15, 1983·50 cites·5 claims
- 2677US4468762ATelemetry equipment in modulesCHRISTENSEN INC·Filed 1981·Granted Aug 28, 1984·49 cites·8 claims
- 2777US4270569AValve assembly for the remote control of fluid flow having an automatic time delayCHRISTENSEN INC·Filed 1978·Granted Jun 2, 1981·56 cites·8 claims
- 2876US4440246ACutting member for rotary drill bitsCHRISTENSEN INC·Filed 1982·Granted Apr 3, 1984·44 cites·6 claims
- 2975US4011918AStabilizer for drill stringsCHRISTENSEN INC·Filed 1976·Granted Mar 15, 1977·38 cites·16 claims
- 3074US4231437ACombined stabilizer and reamer for drilling well boresCHRISTENSEN INC·Filed 1979·Granted Nov 4, 1980·49 cites·12 claims
- 3172US4245709ARemovable drill string stabilizersCHRISTENSEN INC·Filed 1979·Granted Jan 20, 1981·50 cites·10 claims
- 3271US4512425AUp-drill sub for use in rotary drillingCHRISTENSEN INC·Filed 1983·Granted Apr 23, 1985·41 cites·7 claims
- 3369US4356872ADownhole core barrel flushing systemCHRISTENSEN INC·Filed 1980·Granted Nov 2, 1982·35 cites·15 claims
- 3469US4310059AComposite heavy metal drill collarCHRISTENSEN INC·Filed 1980·Granted Jan 12, 1982·35 cites·6 claims
- 3566US4278138AComposite heavy metal drill collarCHRISTENSEN INC·Filed 1980·Granted Jul 14, 1981·36 cites·9 claims
- 3666US4252102ACutting element for processing rocks, metal or the likeCHRISTENSEN INC·Filed 1979·Granted Feb 24, 1981·25 cites·6 claims
- 3765US4361194ABearing system for a downhole motorCHRISTENSEN INC·Filed 1980·Granted Nov 30, 1982·32 cites·28 claims
- 3862US4512419ACoring device with an improved core sleeve and anti-gripping collarCHRISTENSEN INC·Filed 1983·Granted Apr 23, 1985·27 cites·18 claims
- 3960US4265323ADirect bit drive for deep drilling toolsCHRISTENSEN INC·Filed 1979·Granted May 5, 1981·22 cites·20 claims
- 4059US4537097AMethod and apparatus for manufacturing cutting elements particularly for deep drillingCHRISTENSEN INC·Filed 1983·Granted Aug 27, 1985·17 cites·19 claims
- 4158US4499563AApparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling deviceCHRISTENSEN INC·Filed 1982·Granted Feb 12, 1985·23 cites·4 claims
- 4257US4081043AHydraulic jars for bore hole drillingCHRISTENSEN INC·Filed 1977·Granted Mar 28, 1978·19 cites·14 claims
- 4356US4452322ADrilling device for drilling a core in deep drill holesCHRISTENSEN INC·Filed 1982·Granted Jun 5, 1984·21 cites·12 claims
- 4450US4336850AInternal fluid screen to prevent nozzle and port pluggingCHRISTENSEN INC·Filed 1980·Granted Jun 29, 1982·17 cites·7 claims
- 4548US4463815AMechanical jarring toolCHRISTENSEN INC·Filed 1982·Granted Aug 7, 1984·18 cites·11 claims
- 4646US4512423ACoring device with an improved weighted core sleeve and anti-gripping collarCHRISTENSEN INC·Filed 1983·Granted Apr 23, 1985·17 cites·15 claims
- 4743US4275528AElectroplated diamond milling cutterCHRISTENSEN INC·Filed 1979·Granted Jun 30, 1981·12 cites·22 claims
- 4843US4272987APressure core barrel flushing systemCHRISTENSEN INC·Filed 1979·Granted Jun 16, 1981·15 cites·11 claims
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