KVAERNER NATIONAL, 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 195

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6003602 Tree bore protectorSep 05, 97Dec 21, 99[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5129311 Piston assembly with primary and co-centric secondary portionsExpiredJul 16, 90Jul 14, 92[F01B]
5081909 Releasable latch mechanism for attaching an actuator to a valveExpiredJul 16, 90Jan 21, 92[F15B]
5082060 Subsea well hangerExpiredJan 16, 90Jan 21, 92[E21B]
5062667 Connection sealExpiredJan 19, 90Nov 05, 91[F16L]
4746246 Remotely actuated cutting assembly for broken underwater guidelinesExpiredOct 14, 81May 24, 88[E21B]
4583746 Method and apparatus for sealing between two concentric membersExpiredOct 26, 84Apr 22, 86[F16L]
4557628 Method and apparatus for remotely cutting broken underwater guidelinesExpiredMar 28, 84Dec 10, 85[B63C]
4550782 Method and apparatus for independent support of well pipe hangersExpiredDec 06, 82Nov 05, 85[F16L, E21B]
4528738 Dual ring casing hangerExpiredJan 23, 84Jul 16, 85[F16L, B23P, E21B]
4490073 Multiple flowline connectorExpiredDec 01, 81Dec 25, 84[F16L, E21B]
4472080 Method for installing and connecting underwater flowlinesExpiredDec 01, 81Sep 18, 84[F16L, E02D, E21B]
4472081 Apparatus for connecting underwater flowlinesExpiredDec 01, 81Sep 18, 84[F16L, E02D, E21B]
4460042 Dual ring casing hangerExpiredOct 29, 81Jul 17, 84[E21B]
4460047 Laterally releasable connector between outer well member and templateExpiredSep 23, 82Jul 17, 84[E21B]
4451056 Remotely operated underwater tension connectorExpiredJul 18, 80May 29, 84[F16L]
4451170 Apparatus for connecting a tension member to an under-water anchoring baseExpiredAug 03, 82May 29, 84[F16D]
4449583 Well devices with annulus check valve and hydraulic by-passExpiredSep 21, 81May 22, 84[E21B]
4445807 Diverless subsea template levelling system and methodExpiredDec 08, 81May 01, 84[E02B]
4443130 Remotely operated tool for performing functions under waterExpiredDec 14, 81Apr 17, 84[B63C, E21B]
4438817 Subsea well with retrievable piping deckExpiredSep 29, 82Mar 27, 84[E21B]

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Top Inventors for This Owner

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