Dowell, a division of Schlumberger Technology Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 1482
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR689
 
  
 
C04B LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS 266
 
  
 
B21B ROLLING OF METAL 131
 
  
 
E03B INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER 112
 
  
 
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS 161
 
  
 
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 1205
 
  
 
H01B CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING, OR DIELECTRIC PROPERTIES 173

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6177385 Metal ion crosslinked fracturing fluid and methodSep 27, 95Jan 23, 01[C09K, E21B]
5962375 Wellbore fluidsJul 29, 96Oct 05, 99[C09K]
5929002 Fluid loss controlApr 06, 95Jul 27, 99[C09K, E21B]
5846913 Invert biodegradable n-alkane(s) wellbore fluid containing less than 10 percent by weight of cycloparaffing isoparaffing and aromatic compounds, and method of drilling with such fluidMar 17, 97Dec 08, 98[C09K, B21B]
5828003 Composite coiled tubing apparatus and methodsJan 29, 96Oct 27, 98[H01B]
5821203 Foamed drilling fluids, their process for preparation and the corresponding drilling methodJun 07, 96Oct 13, 98[C09K]
5730222 Downhole activated circulating subDec 20, 95Mar 24, 98[E21B]
5720598 Method and a system for early detection of defects in multiplex positive displacement pumpsOct 04, 95Feb 24, 98[F04B]
5697441 Selective zonal isolation of oil wellsMar 20, 96Dec 16, 97[E21B]
5617921 Over-pressured well fracturing with surface reservoir and actuator systemSep 29, 95Apr 08, 97[E21B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5877585 Mounting assembly arrangement for a compact fluorescent lampExpiredOct 16, 95Mar 02, 99[H01J]
5685574 Snap latch seal locator for sealingly latching tubing to a packer in a wellboreExpiredFeb 28, 95Nov 11, 97[F16L]
5660241 Pressure compensated weight on bit shock sub for a wellbore drilling toolExpiredDec 20, 95Aug 26, 97[E21B]
5582250 Overbalanced perforating and fracturing process using low-density, neutrally buoyant proppantExpiredNov 09, 95Dec 10, 96[E21B]
5573225 Means for placing cable within coiled tubingExpiredMay 06, 94Nov 12, 96[B66F]
5547027 Low temperature, low rheology synthetic cementExpiredMay 24, 95Aug 20, 96[E21B]
5547926 New compositions for iron control in acid treatments for oil wellsExpiredJul 09, 92Aug 20, 96[E21B]
5488989 Whipstock orientation method and systemExpiredJun 02, 94Feb 06, 96[E21B]

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