DUHN OIL TOOL, INC

Organization

BAKERSFIELD, CA, US

Organizations

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Patents Grantslast 30 patents

Information Patent Grant
Wellhead isolation tool and wellhead assembly incorporating the same
- Patent number 7,726,393
- Issue date Jun 1, 2010
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead isolation tool and method of fracturing a well
- Patent number 7,520,322
- Issue date Apr 21, 2009
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead isolation tool and method of fracturing a well
- Patent number 7,493,944
- Issue date Feb 24, 2009
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead isolation tool, wellhead assembly incorporating the same,...
- Patent number 7,416,020
- Issue date Aug 26, 2008
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead isolation tool and method of fracturing a well
- Patent number 7,322,407
- Issue date Jan 29, 2008
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead isolation tool
- Patent number 6,920,925
- Issue date Jul 26, 2005
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Coil tubing hanger system
- Patent number 6,588,510
- Issue date Jul 8, 2003
- Duhn Oil Tool, Inc.
- Gary A. Card
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well tubing rotator
- Patent number 6,543,533
- Issue date Apr 8, 2003
- Duhn Oil Tool, Inc.
- Robert K. Meek
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drilling quick connectors
- Patent number 6,199,914
- Issue date Mar 13, 2001
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ring seal packer
- Patent number 5,303,774
- Issue date Apr 19, 1994
- Duhn Oil Tool, Inc.
- Jay C. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ground subsiding wellhead
- Patent number 4,974,676
- Issue date Dec 4, 1990
- Duhn Oil Tool, Inc.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING

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Patents Applicationslast 30 patents

Information Patent Application
WELLHEAD ISOLATION TOOL AND WELLHEAD ASSEMBLY INCORPORATING THE SAME
- Publication number 20120227956
- Publication date Sep 13, 2012
- DUHN OIL TOOL, INC.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING
Information Patent Application
Wellhead isolation tool and method of fracturing a well
- Publication number 20080093067
- Publication date Apr 24, 2008
- DUHN OIL TOOL, INC.
- Rex E. Duhn
- E21 - EARTH DRILLING MINING

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Trademarklast 30 trademarks

Information Trademark
78513428 - Q92
- Serial number 78513428
- Registration number 3089634
- Filing date Nov 8, 2004
- DUHN OIL TOOL, INC.
- 7 - Machines and machine tools
Information Trademark
76281436 - QDF
- Serial number 76281436
- Registration number 2665728
- Filing date Jun 28, 2001
- DUHN OIL TOOL, INC.
- 7 - Machines and machine tools
Information Trademark
76281437 - WHI
- Serial number 76281437
- Registration number 2668310
- Filing date Jun 28, 2001
- DUHN OIL TOOL, INC.
- 7 - Machines and machine tools
Information Trademark
76281438 - QUICK LOCK WELLHEAD SYSTEM
- Serial number 76281438
- Registration number 2948576
- Filing date Jun 28, 2001
- DUHN OIL TOOL, INC.
- 7 - Machines and machine tools
Information Trademark
76281433 - WHI
- Serial number 76281433
- Registration number 2751856
- Filing date Jun 28, 2001
- DUHN OIL TOOL, INC.
- 7 - Machines and machine tools

DUHN OIL TOOL, INC

Organization

Patents Grantslast 30 patents

Wellhead isolation tool and wellhead assembly incorporating the same

Wellhead isolation tool and method of fracturing a well

Wellhead isolation tool and method of fracturing a well

Wellhead isolation tool, wellhead assembly incorporating the same,...

Wellhead isolation tool and method of fracturing a well

Wellhead isolation tool

Coil tubing hanger system

Well tubing rotator

Drilling quick connectors

Ring seal packer

Ground subsiding wellhead

Patents Applicationslast 30 patents

WELLHEAD ISOLATION TOOL AND WELLHEAD ASSEMBLY INCORPORATING THE SAME

Wellhead isolation tool and method of fracturing a well

Trademarklast 30 trademarks

78513428 - Q92

76281436 - QDF

76281437 - WHI

76281438 - QUICK LOCK WELLHEAD SYSTEM

76281433 - WHI