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Michael D. Stevens
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Duncan, OK, US
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Patents Grants
last 30 patents
Information
Patent Grant
Methods and apparatus for use in subterranean cementing operations
Patent number
7,255,162
Issue date
Aug 14, 2007
Halliburton Energy Services, Inc.
Michael D. Stevens
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Floating plate back pressure valve assembly
Patent number
7,108,068
Issue date
Sep 19, 2006
Halliburton Energy Services, Inc.
Michael D. Stevens
Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information
Patent Grant
Anti-rotation method and apparatus for limiting rotation of cementi...
Patent number
6,997,253
Issue date
Feb 14, 2006
Halliburton Energy Services, Inc.
Earl D. Webb
E21 - EARTH DRILLING MINING
Information
Patent Grant
Anti-rotation method and apparatus for limiting rotation of cementi...
Patent number
6,896,051
Issue date
May 24, 2005
Halliburton Energy Services, Inc.
Earl D. Webb
E21 - EARTH DRILLING MINING
Information
Patent Grant
Snap-lock seal for seal valve assembly
Patent number
6,820,695
Issue date
Nov 23, 2004
Halliburton Energy Services, Inc.
Michael D. Stevens
E21 - EARTH DRILLING MINING
Information
Patent Grant
Anti-rotation apparatus for limiting rotation of cementing plugs
Patent number
6,796,377
Issue date
Sep 28, 2004
Halliburton Energy Services, Inc.
Charles A. Butterfield
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
Information
Patent Application
Floating plate back pressure valve assembly
Publication number
20050274525
Publication date
Dec 15, 2005
Michael D. Stevens
E21 - EARTH DRILLING MINING
Information
Patent Application
Methods and apparatus for use in subterranean cementing operations
Publication number
20050247458
Publication date
Nov 10, 2005
Michael D. Stevens
E21 - EARTH DRILLING MINING
Information
Patent Application
Moled foam plugs, plug systems and methods of using same
Publication number
20050103493
Publication date
May 19, 2005
Michael D. Stevens
E21 - EARTH DRILLING MINING
Information
Patent Application
Anti-rotation method and apparatus for limiting rotation of cementi...
Publication number
20040261991
Publication date
Dec 30, 2004
Earl D. Webb
E21 - EARTH DRILLING MINING
Information
Patent Application
Anti-rotation method and apparatus for limiting rotation of cementi...
Publication number
20040144531
Publication date
Jul 29, 2004
Earl D. Webb
E21 - EARTH DRILLING MINING
Information
Patent Application
Anti-rotation method and apparatus for limiting rotation of cementi...
Publication number
20040016538
Publication date
Jan 29, 2004
Charles A. Butterfield
E21 - EARTH DRILLING MINING
Information
Patent Application
Snap-lock seal for seal valve assembly
Publication number
20040007359
Publication date
Jan 15, 2004
Michael D. Stevens
E21 - EARTH DRILLING MINING