Steven H. Shirk

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Broken Arrow, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Computer controlled downhole safety valve system
- Patent number 6,199,629
- Issue date Mar 13, 2001
- Baker Hughes Incorporated
- Steve Shirk
- E21 - EARTH DRILLING MINING
Information Patent Grant
Lock open mechanism for downhole safety valve
- Patent number 4,967,845
- Issue date Nov 6, 1990
- Baker Hughes Incorporated
- Steven H. Shirk
- E21 - EARTH DRILLING MINING
Information Patent Grant
Releasable well tool stabilizer
- Patent number 4,960,173
- Issue date Oct 2, 1990
- Baker Hughes Incorporated
- Michael L. Cognevich
- E21 - EARTH DRILLING MINING