DOWELL SCHLUMBERGER INCORPORATED
Patent Owner
Stats
- 21 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Sep 07, 1999 most recent publication
Details
- 21 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 6,665 Total Citation Count
- May 08, 1972 Earliest Filing
- 160 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
Intl Class
Technology
Matters
Rank in Class
Top Patents (by citation)
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Recent Publications
- No Recent Publications to Display
Recent Patents
Patent #
Title
Filing Date
Issue Date
Intl Class
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]
Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
5415228 Fluid loss control additives for use with gravel pack placement fluidsExpiredDec 07, 93May 16, 95[E21B]
5314014 Packer and valve assembly for temporary abandonment of wellsExpiredMay 04, 92May 24, 94[E21B]
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]
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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