Douglas K. McLean

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Dallas, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Wellhead flow control devices
- Patent number 4,289,294
- Issue date Sep 15, 1981
- Double-E, Inc.
- Douglas K. McLean
- E21 - EARTH DRILLING MINING
Information Patent Grant
Packing assembly for a movable shaft
- Patent number 4,286,791
- Issue date Sep 1, 1981
- Double-E Inc.
- Douglas K. McLean
- E21 - EARTH DRILLING MINING