Inventor · disambiguated record
Derek W. Logan
Also filed as: LOGAN DEREK · LOGAN DEREK W · LOGAN DEREK WILLIAM
20 granted patents·3 pending applications·552 citations·filing 1998–2014
95Inventor score
Files withSCHLUMBERGER TECHNOLOGY CORP5EXTREME ENGINEERING LTD3RYAN ENERGY TECHNOLOGIES INC3CAMWELL PAUL L2DOPF ANTHONY R2
Top patents by PatentIndex Score
23 records- 0194US8115651B2Drill string telemetry methods and apparatusCAMWELL PAUL L·Filed 2008·Granted Feb 14, 2012·71 cites·21 claims
- 0290US7252160B2Electromagnetic gap sub assemblyWEATHERFORD LAMB·Filed 2004·Granted Aug 7, 2007·50 cites·26 claims
- 0390US6050353ASubassembly electrical isolation connector for drill rodRYAN ENERGY TECHNOLOGIES INC·Filed 1998·Granted Apr 18, 2000·74 cites·10 claims
- 0489US8308199B2Electrical isolation connector for electromagnetic gap subCAMWELL PAUL L·Filed 2010·Granted Nov 13, 2012·12 cites·20 claims
- 0587US6956791B2Apparatus for receiving downhole acoustic signalsXACT DOWNHOLE TELEMETRY INC·Filed 2003·Granted Oct 18, 2005·65 cites·8 claims
- 0685US7839719B2Fluid erosion protection washer for rotating shaft in MWD toolSCHLUMBERGER TECHNOLOGY CORP·Filed 2009·Granted Nov 23, 2010·29 cites·11 claims
- 0783US6158532ASubassembly electrical isolation connector for drill rodRYAN ENERGY TECHNOLOGIES INC·Filed 1999·Granted Dec 12, 2000·100 cites·18 claims
- 0880US6902414B2Harsh environment rotatable connectorEXTREME ENGINEERING LTD·Filed 2003·Granted Jun 7, 2005·59 cites·27 claims
- 0979US7900968B2Electrical isolation connector for electromagnetic gap subSCHLUMBERGER TECHNOLOGY CORP·Filed 2007·Granted Mar 8, 2011·16 cites·7 claims
- 1074US7462957B2Multi-conductor plug and socket apparatusEXTREME ENGINEERING LTD·Filed 2003·Granted Dec 9, 2008·23 cites·12 claims
- 1168US8648733B2Electromagnetic telemetry assembly with protected antennaDOPF ANTHONY R·Filed 2009·Granted Feb 11, 2014·12 cites·19 claims
- 1260US9109403B2Drill bit assembly having electrically isolated gap joint for electromagnetic telemetryLOGAN DEREK·Filed 2009·Granted Aug 18, 2015·3 cites·22 claims
- 1358US6367323B1Dynamic pressure device for oil drill systemsRYAN ENERGY TECHNOLOGIES INC·Filed 2000·Granted Apr 9, 2002·25 cites·13 claims
- 1456US8270251B2Acoustic isolatorDRUMHELLER DOUGLAS S·Filed 2009·Granted Sep 18, 2012·4 cites·17 claims
- 1555US9022144B2Drill bit assembly having electrically isolated gap joint for measurement of reservoir propertiesCLARK BRIAN·Filed 2009·Granted May 5, 2015·3 cites·20 claims
- 1651US2015101867A1Drill Bit Assembly Having Electrically Isolated Gap Joint for Measurement of Reservoir PropertiesSCHLUMBERGER TECHNOLOGY CORP·Filed 2014·Application pending·0 cites
- 1748US7821178B2Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motorsSCHLUMBERGER TECHNOLOGY CORP·Filed 2006·Granted Oct 26, 2010·2 cites·14 claims
- 1846US8624464B2Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motorsDOPF ANTHONY R·Filed 2010·Granted Jan 7, 2014·1 cites·14 claims
- 1944US2010043229A1Electrical Isolation Connector For Electromagnetic Gap SubSCHLUMBERGER TECHNOLOGY CORP·Filed 2009·Application pending·0 cites
- 2037US7532540B2Fluid erosion protection washer for rotating shaft in MWD toolEXTREME ENGINEERING LTD·Filed 2006·Granted May 12, 2009·0 cites·8 claims
- 2137USD532602STool taxiFISKARS BRANDS INC·Filed 2006·Granted Nov 28, 2006·3 cites·1 claims
- 2237US2007257809A1Acoustic telemetry system optimizationXACT DOWNHOLE TELEMETRY INC·Filed 2007·Application pending·0 cites
- 2328US9004196B2Drill bit assembly having aligned featuresHAUGVALDSTAD KJELL·Filed 2009·Granted Apr 14, 2015·0 cites·25 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →