Inventor · disambiguated record
John D. Barr
Also filed as: BARR JOHN D · BARR JOHN DAVID
44 granted patents·1 pending application·4,305 citations·filing 1981–2008
99Inventor score
Files withNL INDUSTRIES INC11NL PETROLEUM PROD7CAMCO DRILLING GROUP LTD6REED TOOL CO6SPECTRA LOGIC CORP4
Top patents by PatentIndex Score
45 records- 0199US5265682ASteerable rotary drilling systemsCAMCO DRILLING GROUP LTD·Filed 1992·Granted Nov 30, 1993·416 cites·24 claims
- 0298US5706905ASteerable rotary drilling systemsCAMCO DRILLING GROUP LTD·Filed 1996·Granted Jan 13, 1998·416 cites·15 claims
- 0398US5520255AModulated bias unit for rotary drillingCAMCO DRILLING GROUP LTD·Filed 1995·Granted May 28, 1996·329 cites·10 claims
- 0497US5582259AModulated bias unit for rotary drillingCAMCO DRILLING GROUP LTD·Filed 1995·Granted Dec 10, 1996·219 cites·7 claims
- 0597US5553678AModulated bias units for steerable rotary drilling systemsCAMCO INT·Filed 1992·Granted Sep 10, 1996·425 cites·35 claims
- 0697US5025874ACutting elements for rotary drill bitsREED TOOL COMPANY LTD·Filed 1989·Granted Jun 25, 1991·106 cites·22 claims
- 0796US6089332ASteerable rotary drilling systemsCAMCO INT UK LTD·Filed 1998·Granted Jul 18, 2000·279 cites·16 claims
- 0896US5803185ASteerable rotary drilling systems and method of operating such systemsCAMCO DRILLING GROUP LTD·Filed 1996·Granted Sep 8, 1998·277 cites·16 claims
- 0996US4593777ADrag bit and cuttersNL INDUSTRIES INC·Filed 1984·Granted Jun 10, 1986·162 cites·16 claims
- 1095US5695015ASystem and method of controlling rotation of a downhole instrument packageCAMCO DRILLING GROUP LTD OF HY·Filed 1996·Granted Dec 9, 1997·231 cites·22 claims
- 1195US5685379AMethod of operating a steerable rotary drilling systemCAMCO DRILLING GROUP LTD OF HY·Filed 1996·Granted Nov 11, 1997·249 cites·25 claims
- 1294US4780274AManufacture of rotary drill bitsREED TOOL COMPANY LTD·Filed 1986·Granted Oct 25, 1988·109 cites·33 claims
- 1394US4694919ARotary drill bits with nozzle former and method of manufacturingNL PETROLEUM PROD·Filed 1986·Granted Sep 22, 1987·113 cites·9 claims
- 1492US4558753ADrag bit and cuttersNL INDUSTRIES INC·Filed 1983·Granted Dec 17, 1985·94 cites·26 claims
- 1589US4382477ARotary drill bitsDRILLING & SERVICE UK LTD·Filed 1981·Granted May 10, 1983·53 cites·17 claims
- 1687US4679639ARotary drill bits and cutting elements for such bitsNL PETROLEUM PROD·Filed 1984·Granted Jul 14, 1987·73 cites·26 claims
- 1784US4804049ARotary drill bitsNL PETROLEUM PROD·Filed 1984·Granted Feb 14, 1989·60 cites·8 claims
- 1884US4505342ADrill bitNL INDUSTRIES INC·Filed 1982·Granted Mar 19, 1985·63 cites·29 claims
- 1983US4624830AManufacture of rotary drill bitsNL PETROLEUM PROD·Filed 1984·Granted Nov 25, 1986·35 cites·27 claims
- 2080US4995887ACutting elements for rotary drill bitsREED TOOL CO·Filed 1989·Granted Feb 26, 1991·30 cites·38 claims
- 2178US4942933ARelating to rotary drill bitsREED TOOL CO·Filed 1988·Granted Jul 24, 1990·52 cites·13 claims
- 2275US5165494ARotary drills bitsCAMCO DRILLING GROUP LTD·Filed 1990·Granted Nov 24, 1992·51 cites·4 claims
- 2375US4660659ADrag type drill bitNL INDUSTRIES INC·Filed 1985·Granted Apr 28, 1987·48 cites·23 claims
- 2475US4640375ADrill bit and cutter thereforNL INDUSTRIES INC·Filed 1984·Granted Feb 3, 1987·41 cites·18 claims
- 2572US4605157ADrill bit manufacturing methodNL INDUSTRIES INC·Filed 1984·Granted Aug 12, 1986·24 cites·23 claims
- 2671US4733735ARotary drill bitsNL PETROLEUM PROD·Filed 1986·Granted Mar 29, 1988·43 cites·28 claims
- 2769US4577706ARotary drill bitsNL PETROLEUM PROD·Filed 1983·Granted Mar 25, 1986·35 cites·14 claims
- 2865US5099934ARotary drill bitsBARR JOHN D·Filed 1990·Granted Mar 31, 1992·43 cites·18 claims
- 2964US7450331B2Variable mobile media storage systemSPECTRA LOGIC CORP·Filed 2007·Granted Nov 11, 2008·2 cites·17 claims
- 3062US4676324ADrill bit and cutter thereforNL INDUSTRIES INC·Filed 1986·Granted Jun 30, 1987·31 cites·19 claims
- 3161US6877241B2Measurement of curvature of a subsurface borehole, and use of such measurement in directional drillingSCHLUMBERGER TECHNOLOGY CORP·Filed 2002·Granted Apr 12, 2005·23 cites·24 claims
- 3261US5061293ACutting elements for rotary drill bitsBARR JOHN D·Filed 1990·Granted Oct 29, 1991·17 cites·7 claims
- 3360US4727946ARotary drill bitsNL INDUSTRIES INC·Filed 1986·Granted Mar 1, 1988·29 cites·20 claims
- 3457US4711144ADrill bit and method of manufactureNL INDUSTRIES INC·Filed 1986·Granted Dec 8, 1987·27 cites·13 claims
- 3554US7253983B2Variable media tape-based storage systemSPECTRA LOGIC CORP·Filed 2004·Granted Aug 7, 2007·3 cites·23 claims
- 3650US7414807B2Variable mobile media storage systemSPECTRA LOGIC CORP·Filed 2006·Granted Aug 19, 2008·0 cites·18 claims
- 3749US4570725ADrill bit cutterNL INDUSTRIES INC·Filed 1984·Granted Feb 18, 1986·15 cites·7 claims
- 3847US4873895AManufacture of rotary drill bitsREED TOOL CO·Filed 1988·Granted Oct 17, 1989·20 cites·15 claims
- 3947US2008183934A1Optional mobile media storage systemSPECTRA LOGIC CORP·Filed 2008·Application pending·0 cites
- 4044US4898252ACutting structures for rotary drill bitsREED TOOL CO·Filed 1988·Granted Feb 6, 1990·14 cites·20 claims
- 4143US5101691AMethods of manufacturing cutter assemblies for rotary drill bitsREED TOOL CO·Filed 1990·Granted Apr 7, 1992·8 cites·12 claims
- 4242US4878403AManufacture of rotary drill bitsREED TOOL CO·Filed 1988·Granted Nov 7, 1989·7 cites·5 claims
- 4342US4669556ADrill bit and cutter thereforNL INDUSTRIES INC·Filed 1985·Granted Jun 2, 1987·13 cites·21 claims
- 4438US4697654ARotary drill bitsNL PETROLEUM PROD·Filed 1985·Granted Oct 6, 1987·10 cites·29 claims
- 4537US4862977ADrill bit and cutter thereforREED TOOL COMPANY LTD·Filed 1987·Granted Sep 5, 1989·10 cites·18 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →