Donald J. Barrus

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Los Alamintos, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
High pressure automatic mud saver valve
- Patent number 5,253,704
- Issue date Oct 19, 1993
- KOB, Inc.
- Reginald J. Barrus
- E21 - EARTH DRILLING MINING
Information Patent Grant
High pressure automatic kelly valve
- Patent number 4,969,513
- Issue date Nov 13, 1990
- KOB, Inc.
- Reginald J. Barrus
- E21 - EARTH DRILLING MINING