CTC INTERNATIONAL CORPORATION

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Patent Activity in the Last 10 Years

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Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 789

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5396954 Subsea inflatable packer systemJan 27, 94Mar 14, 95[E21B]
5366019 Horizontal inflatable toolMar 30, 93Nov 22, 94[E21B]
5358048 Hydraulic port collarApr 27, 93Oct 25, 94[E21B]
5348093 Cementing systems for oil wellsAug 19, 92Sep 20, 94[E21B]
5271469 Borehole stressed packer inflation systemApr 08, 92Dec 21, 93[E21B]
5186258 Horizontal inflation toolAug 22, 91Feb 16, 93[E21B]
RE30711 Well completion method and systemApr 27, 78Aug 18, 81[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5082062 Horizontal inflatable toolExpiredSep 21, 90Jan 21, 92[E21B]
4967846 Progressively inflated packersExpiredSep 14, 89Nov 06, 90[E21B]
4897139 Method of producing progressively inflated packersExpiredJul 18, 88Jan 30, 90[B29C]
4871179 Inflatable packer with roughened mandrelExpiredJan 24, 83Oct 03, 89[F16L, E21B, F16J]
4781249 Progressively inflated packersExpiredApr 04, 84Nov 01, 88[E21B]
4744421 Inflatable packer systemsExpiredApr 01, 83May 17, 88[E21B]
RE32438 Well packer valve arrangementExpiredJun 21, 84Jun 16, 87[E21B, F16J]
4655286 Method for cementing casing or liners in an oil wellExpiredFeb 19, 85Apr 07, 87[E21B]
RE32345 Packer valve arrangementExpiredJun 21, 84Feb 03, 87[E02D, E21B, F16J]
4607698 Pipe configuration compatible with CBLExpiredJan 25, 85Aug 26, 86[E21B]
4606406 Inflatable packer compatible with CBLExpiredJan 28, 85Aug 19, 86[E21B]
4577689 Method for determining true fracture pressureExpiredAug 24, 84Mar 25, 86[E21B]
4577695 Sequential inflatable packerExpiredApr 04, 84Mar 25, 86[E21B]
4577696 Sequential inflatable packerExpiredApr 05, 84Mar 25, 86[E21B]
4527625 Packer valve arrangementExpiredJun 06, 84Jul 09, 85[E21B]
4492383 Inflatable well bore packer with pressure equalized rib cavityExpiredMar 09, 84Jan 08, 85[E21B, F16J]
4440226 Well completion methodExpiredDec 08, 82Apr 03, 84[E21B]
4420159 Packer valve arrangementExpiredAug 13, 82Dec 13, 83[E02D, E21B]
4402517 Well packer valve arrangementExpiredAug 13, 82Sep 06, 83[E21B, F16J]
4378843 Method for completion of wellsExpiredFeb 11, 81Apr 05, 83[E21B]

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