Inventor
Derek W. Logan
Inventor
Calgary, CA
Overview
Patents· 20 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling44%
F16LPipes12%
H01RElectrically-conductive connections12%
G01VGeophysics9%
Y10TTechnical subjects covered by former us classification6%
H02KDynamo-electric machines3%
H04LTransmission of digital information, e.g. telegraphic communication3%
H04WWireless communication networks3%
LOC033%
Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use3%
PatentTitleYear
9,109,403'Drill bit assembly having electrically isolated gap joint for electromagnetic telemetry'20159,022,144'Drill bit assembly having electrically isolated gap joint for measurement of reservoir properties'20159,004,196'Drill bit assembly having aligned features'20158,648,733'Electromagnetic telemetry assembly with protected antenna'20148,624,464'Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors'20148,308,199'Electrical isolation connector for electromagnetic gap sub'20128,270,251'Acoustic isolator'20128,115,651'Drill string telemetry methods and apparatus'20127,900,968'Electrical isolation connector for electromagnetic gap sub'20117,839,719'Fluid erosion protection washer for rotating shaft in MWD tool'20107,821,178'Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors'20107,532,540'Fluid erosion protection washer for rotating shaft in MWD tool'20097,462,957'Multi-conductor plug and socket apparatus'20087,252,160'Electromagnetic gap sub assembly'2007D0532602'Tool taxi'20066,956,791'Apparatus for receiving downhole acoustic signals'20056,902,414'Harsh environment rotatable connector'20056,367,323'Dynamic pressure device for oil drill systems'20026,158,532'Subassembly electrical isolation connector for drill rod'20006,050,353'Subassembly electrical isolation connector for drill rod'2000Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2000–2015Based in Calgary, CA· patent location history
2006Based in Charleston, MA, US· patent location history
2010–2015Patents assigned to SCHLUMBERGER TECHNOLOGY CORP (9)· patent assignee history
2012–2015Patents assigned to LOGAN DEREK W (6)· patent assignee history
2012–2015Patents assigned to DOPF ANTHONY R (5)· patent assignee history
2012–2014Patents assigned to CAMWELL PAUL L (4)· patent assignee history
2014–2015Patents assigned to HOLMEN GARRY (4)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SCHLUMBERGER TECHNOLOGY CORP | 9 | 2010–2015 |
| LOGAN DEREK Wself | 6 | 2012–2015 |
| DOPF ANTHONY R | 5 | 2012–2015 |
| CAMWELL PAUL L | 4 | 2012–2014 |
| HOLMEN GARRY | 4 | 2014–2015 |
Locations
| Location | Patents | Span |
|---|---|---|
| Calgary, CA | 19 | 2000–2015 |
| Charleston, Massachusetts, US | 1 | 2006 |