DUAL GRADIENT SYSTEMS, LLC

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 888
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR590

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8844653 Continuous circulating sub for drill stringsJun 16, 11Sep 30, 14[E21B]
8393403 Drill string flow control valves and methodsOct 30, 09Mar 12, 13[E21B]
8066079 Drill string flow control valves and methodsApr 29, 09Nov 29, 11[E21B]
7992654 Dual gradient drilling method and apparatus with an adjustable centrifugeAug 22, 08Aug 09, 11[C09K, E21B]
7992655 Dual gradient drilling method and apparatus with multiple concentric drill tubes and blowout preventersNov 21, 05Aug 09, 11[E21B]
7762357 Dual gradient drilling method and apparatus with an adjustable centrifugeAug 22, 08Jul 27, 10[C09K, E21B]
7093662 System for drilling oil and gas wells using a concentric drill string to deliver a dual density mudOct 29, 03Aug 22, 06[E21B]
7090036 System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditionsJul 17, 03Aug 15, 06[C09K]
6843331 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applicationsNov 06, 02Jan 18, 05[C09K]
6536540 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applicationsFeb 15, 01Mar 25, 03[C09K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7584801 Drill string flow control valves and methodsExpiredApr 20, 07Sep 08, 09[E21B]
2009/0044,950 Buoyancy tensioning systems for offshore marine risers and methods of useAbandonedAug 13, 08Feb 19, 09[B63B, E21B]
6966392 Method for varying the density of drilling fluids in deep water oil and gas drilling applicationsExpiredJun 13, 03Nov 22, 05[C09K]
6926101 System and method for treating drilling mud in oil and gas well drilling applicationsExpiredMar 17, 03Aug 09, 05[C09K]

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