NOWSCO WELL SERVICE LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 294

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6729409 Foamed nitrogen in liquid CO2 for fracturingOct 05, 01May 04, 04[E21B]
6015015 Insulated and/or concentric coiled tubingJan 27, 97Jan 18, 00[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5429036 Remote hydraulic pressure intensifierExpiredJan 21, 94Jul 04, 95[F01B]
5063997 Method of preventing precipitation of iron compounds during acid treatment of wellsExpiredJan 04, 90Nov 12, 91[E21B]
4991651 Pipeline packer for plugging a pipeline at a desired locationExpiredJun 14, 89Feb 12, 91[F16L]
4854384 Pipeline packerExpiredNov 02, 87Aug 08, 89[E21B]

Top Inventors for This Owner

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