Ed Evans

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Spring, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Casing drilling connector with low stress flex groove
- Patent number 6,406,070
- Issue date Jun 18, 2002
- Grant Prideco, L.P.
- Richard W. DeLange
- E21 - EARTH DRILLING MINING
Information Patent Grant
Threaded connection for enhanced fatigue resistance
- Patent number 5,931,511
- Issue date Aug 3, 1999
- Grant Prideco, Inc.
- Richard DeLange
- E21 - EARTH DRILLING MINING