SOTAT INC.

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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
5295536 Drilling mud container apparatusNov 23, 92Mar 22, 94[E21B]
5123484 Pipe handling clampApr 05, 91Jun 23, 92[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5178214 Restriction sub with deformable plastic sleeveExpiredMar 09, 92Jan 12, 93[E21B]
5165473 Positive stop collarExpiredJun 17, 91Nov 24, 92[E21B]
5105883 Casing restriction subExpiredApr 01, 91Apr 21, 92[E21B]
5095988 Plug injection method and apparatusExpiredFeb 19, 91Mar 17, 92[E21B]
5004048 Apparatus for injecting displacement plugsExpiredNov 15, 89Apr 02, 91[E21B]
4907649 Restriction subs for setting cement plugs in wellsExpiredOct 26, 88Mar 13, 90[E21B]
4674573 Method and apparatus for placing cement plugs in wellsExpiredSep 09, 85Jun 23, 87[E21B]

Top Inventors for This Owner

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