DOWELL SCHLUMBERGER INCORPORATED

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 1284
 
  
 
C04B LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS 266
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR293
 
  
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 141
 
  
 
B23P OTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 155
 
  
 
B28C PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER 114
 
  
 
B65D CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES 197
 
  
 
B67D DISPENSING, DELIVERING, OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR 141
 
  
 
E03B INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER 112
 
  
 
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS 161

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5948733 Fluid loss controlSep 18, 96Sep 07, 99[C09K]
5933945 Composite coiled tubing apparatus and methodsJan 26, 98Aug 10, 99[H01R]
5884701 Dual downhole injection system utilizing coiled tubingJul 18, 97Mar 23, 99[E21B]
5627143 Wellbore fluidJan 31, 95May 06, 97[C09K]
5594050 Cement composition containing chemically crosslinked polyvinyl alcohol (PVA)Mar 27, 96Jan 14, 97[C04B]
5503672 High temperature retarders for oil field cements, cement slurries and corresponding cementing processesMar 08, 94Apr 02, 96[C04B]
5466063 Device for continuously mixing liquid additives into a fluidSep 23, 94Nov 14, 95[B28C, B01F]
5445223 Delayed borate crosslinked fracturing fluid having increased temperature rangeMar 15, 94Aug 29, 95[E21B]
5439055 Control of particulate flowback in subterranean wellsMar 08, 94Aug 08, 95[E21B]
5431219 Forming casing window off whipstock set in cement plugJun 27, 94Jul 11, 95[E03B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5573225 Means for placing cable within coiled tubingExpiredMay 06, 94Nov 12, 96[B66F]
5488989 Whipstock orientation method and systemExpiredJun 02, 94Feb 06, 96[E21B]
5439053 Reinforcing slat for inflatable packerExpiredJul 13, 93Aug 08, 95[E21B]
5415228 Fluid loss control additives for use with gravel pack placement fluidsExpiredDec 07, 93May 16, 95[E21B]
5404947 Pre-formed stress rings for inflatable packersExpiredSep 28, 93Apr 11, 95[E21B]
5390738 Inflatable packer inner bladder retention and sealExpiredNov 25, 92Feb 21, 95[E21B]
5361479 Method of assembly for inflatable packerExpiredNov 25, 92Nov 08, 94[B23P]
5314014 Packer and valve assembly for temporary abandonment of wellsExpiredMay 04, 92May 24, 94[E21B]
5287930 Valve apparatus for use in sand controlExpiredMay 22, 92Feb 22, 94[E21B]
5280824 Sealing element for inflatable packerExpiredNov 25, 92Jan 25, 94[E21B]
5230363 Suction valve for high pressure slurry pumpExpiredApr 10, 91Jul 27, 93[F16K]
5229017 Method of enhancing methane production from coal seams by dewateringExpiredMar 01, 90Jul 20, 93[E21B]
5203413 Product and process for acid diversion in the treatment of subterranean formationsExpiredSep 10, 91Apr 20, 93[E21B]
5199489 Method of cementing well casing to avoid gas channelling from shallow gas-bearing formationsExpiredNov 30, 90Apr 06, 93[F21B]
5190675 Gelling organic liquidsExpiredJan 05, 90Mar 02, 93[B01J, E21B]
5171041 Reinforced flanges on plastic pipeExpiredMar 10, 92Dec 15, 92[F16L]
5120471 Process and composition for protecting chrome steelExpiredAug 01, 90Jun 09, 92[C23F]
5105659 Detection of fracturing events using derivatives of fracturing pressuresExpiredSep 19, 90Apr 21, 92[E21B]
5103905 Method of optimizing the conductivity of a propped fractured formationExpiredMay 03, 90Apr 14, 92[E21B]
5103910 Delayed rigid foam systems and applications in particular for selective plugging treatments in the oil industryExpiredJan 26, 90Apr 14, 92[E21B]

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