Dowell, a division of Schlumberger Technology Corporation
Patent Owner
Stats
- 24 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Jan 23, 2001 most recent publication
Details
- 24 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 2,512 Total Citation Count
- Jul 09, 1992 Earliest Filing
- 8 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
Intl Class
Technology
Matters
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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
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]
5821203 Foamed drilling fluids, their process for preparation and the corresponding drilling methodJun 07, 96Oct 13, 98[C09K]
5720598 Method and a system for early detection of defects in multiplex positive displacement pumpsOct 04, 95Feb 24, 98[F04B]
5617921 Over-pressured well fracturing with surface reservoir and actuator systemSep 29, 95Apr 08, 97[E21B]
Expired/Abandoned/Withdrawn Patents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]
5547926 New compositions for iron control in acid treatments for oil wellsExpiredJul 09, 92Aug 20, 96[E21B]
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