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Patent applications and USPTO patent grants for Berry; Douglas W..The latest application filed is for "tandem progressive cavity pumps".
Patent | Date |
---|---|
Tandem progressive cavity pumps Grant 8,726,981 - Berry May 20, 2 | 2014-05-20 |
Bottom tag for progressing cavity pump rotor with coiled tubing access Grant 8,333,244 - Johnson , et al. December 18, 2 | 2012-12-18 |
Tandem Progressive Cavity Pumps App 20120305263 - Berry; Douglas W. | 2012-12-06 |
Insertable Surface-driven Pump App 20110284238 - Berry; Douglas W. ;   et al. | 2011-11-24 |
Bottom Tag for Progressing Cavity Pump Rotor with Coiled Tubing Access App 20110094730 - Johnson; Nicholas D. ;   et al. | 2011-04-28 |
Tubing driven progressing cavity pump and method of pumping well fluid from a well Grant 7,628,209 - Berry , et al. December 8, 2 | 2009-12-08 |
Tubing driven progressing cavity pump App 20070209800 - Berry; Douglas W. ;   et al. | 2007-09-13 |
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