Lesley G. Watkins

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Rotary drive disc brake for drawworks
- Patent number 4,226,311
- Issue date Oct 7, 1980
- Loffland Brothers Company
- Earl R. Johnson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Braking system for cable spooling drums
- Patent number 4,168,768
- Issue date Sep 25, 1979
- Loffland Brothers
- Earl R. Johnson
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
Rotary drive disc brake for drawworks
- Patent number 4,144,953
- Issue date Mar 20, 1979
- Loffland Brothers Company
- Earl R. Johnson
- E21 - EARTH DRILLING MINING