Robert L. Hilts

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Farmers Branch, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Well safety valve
- Patent number RE32343
- Issue date Feb 3, 1987
- Otis Engineering Corporation
- Michael B. Vinzant
- 166 - Wells
Information Patent Grant
Apparatus and methods for orienting devices in side pocket mandrels
- Patent number 4,524,833
- Issue date Jun 25, 1985
- Otis Engineering Corporation
- Robert L. Hilts
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well safety valve
- Patent number 4,461,353
- Issue date Jul 24, 1984
- Otis Engineering Corporation
- Michael B. Vinzant
- E21 - EARTH DRILLING MINING