SCHLUMBERGER WCP LIMITED

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 1878
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 1106

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7188685 Hybrid rotary steerable systemDec 13, 02Mar 13, 07[E21B]
6877241 Measurement of curvature of a subsurface borehole, and use of such measurement in directional drillingAug 06, 02Apr 12, 05[E21B]
6715570 Two stage downhole drilling fluid filterSep 17, 02Apr 06, 04[E21B]
6601658 Control method for use with a steerable drilling systemOct 09, 01Aug 05, 03[E21B]
6089332 Steerable rotary drilling systemsJan 08, 98Jul 18, 00[E21B]
5971085 Downhole unit for use in boreholes in a subsurface formationNov 06, 97Oct 26, 99[E21B]
5959380 Prevention of particle accumulation between rotatable components of an electrical machineSep 03, 96Sep 28, 99[H02K]
5803185 Steerable rotary drilling systems and method of operating such systemsFeb 21, 96Sep 08, 98[E21B]
5778992 Drilling assembly for drilling holes in subsurface formationsOct 16, 96Jul 14, 98[E21B]
5706905 Steerable rotary drilling systemsFeb 21, 96Jan 13, 98[E21B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6962214 Rotary seal for directional drilling toolsExpiredDec 18, 01Nov 08, 05[E21B]
2003/0127,252 Motor Driven Hybrid Rotary Steerable SystemAbandonedDec 13, 02Jul 10, 03[E21B]
6588714 Cable protector and supportExpiredFeb 23, 01Jul 08, 03[F16L]
5520255 Modulated bias unit for rotary drillingExpiredMay 31, 95May 28, 96[E21B]

Top Inventors for This Owner

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