Michael L. Cognevich

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Plunger for a downhole reciprocating oil well pump and the method o...
- Patent number 5,141,416
- Issue date Aug 25, 1992
- Dover Resources, Inc.
- Michael L. Cognevich
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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
Information Patent Grant
Pressure equalizing flapper type safety valve for subterranean wells
- Patent number 4,415,036
- Issue date Nov 15, 1983
- Baker Oil Tools, Inc.
- Michael A. Carmody
- E21 - EARTH DRILLING MINING