Duhn; Rex E.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Duhn; Rex E..The latest application filed is for "wellhead isolation tool and wellhead assembly incorporating the same".
- Duhn; Rex E. - Bakersfield CA
- Duhn; Rex E. - The Woodlands TX
| Patent | Date |
|---|---|
| Wellhead isolation tool and wellhead assembly incorporating the same Grant 8,863,829 - Duhn , et al. October 21, 2 | 2014-10-21 |
| Wellhead Isolation Tool And Wellhead Assembly Incorporating The Same App 20130068447 - DUHN; REX E. ; et al. | 2013-03-21 |
| Wellhead isolation tool and wellhead assembly incorporating the same Grant 8,333,237 - Duhn , et al. December 18, 2 | 2012-12-18 |
| Drilling quick connectors Grant RE43,773 - Duhn October 30, 2 | 2012-10-30 |
| Drilling quick connectors Grant RE43,697 - Duhn October 2, 2 | 2012-10-02 |
| Wellhead isolation tool and wellhead assembly incorporating the same Grant 8,272,433 - Duhn , et al. September 25, 2 | 2012-09-25 |
| Wellhead Isolation Tool And Wellhead Assembly Incorporating The Same App 20120227956 - Duhn; Rex E. ; et al. | 2012-09-13 |
| Wellhead Isolation Tool And Wellhead Assembly Incorporating The Same App 20100193178 - Duhn; Rex E. ; et al. | 2010-08-05 |
| Wellhead isolation tool and wellhead assembly incorporating the same Grant 7,726,393 - Duhn , et al. June 1, 2 | 2010-06-01 |
| Wellhead isolation tool and method of fracturing a well Grant 7,520,322 - Duhn , et al. April 21, 2 | 2009-04-21 |
| Wellhead isolation tool and method of fracturing a well Grant 7,493,944 - Duhn , et al. February 24, 2 | 2009-02-24 |
| Wellhead isolation tool and wellhead assembly incorporating the same App 20080223570 - Duhn; Rex E. ; et al. | 2008-09-18 |
| Wellhead isolation tool, wellhead assembly incorporating the same, and method of fracturing a well Grant 7,416,020 - Duhn , et al. August 26, 2 | 2008-08-26 |
| Wellhead isolation tool and method of fracturing a well App 20080093067 - Duhn; Rex E. ; et al. | 2008-04-24 |
| Wellhead isolation tool and method of fracturing a well Grant 7,322,407 - Duhn , et al. January 29, 2 | 2008-01-29 |
| Wellhead isolation tool, wellhead assembly incorporating the same, and method of fracturing a well App 20070272402 - Duhn; Rex E. ; et al. | 2007-11-29 |
| Wellhead isolation tool and method of fracturing a well App 20060060349 - Duhn; Rex E. ; et al. | 2006-03-23 |
| Wellhead isolation tool Grant 6,920,925 - Duhn , et al. July 26, 2 | 2005-07-26 |
| Wellhead isolation tool and method of fracturing a well App 20050092496 - Duhn, Rex E. ; et al. | 2005-05-05 |
| Wellhead isolation tool App 20030221823 - Duhn, Rex E. ; et al. | 2003-12-04 |
| Connections for wellhead equipment App 20030205385 - Duhn, Rex E. ; et al. | 2003-11-06 |
| Well tubing rotator Grant 6,543,533 - Meek , et al. April 8, 2 | 2003-04-08 |
| Well tubing rotator App 20020121367 - Meek, Robert K. ; et al. | 2002-09-05 |
| Drilling quick connectors App 20020070545 - Meek, Robert K. ; et al. | 2002-06-13 |
| Drilling quick connectors Grant 6,199,914 - Duhn March 13, 2 | 2001-03-13 |
| Ground subsiding wellhead Grant 4,974,676 - Duhn , et al. December 4, 1 | 1990-12-04 |
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