David L. Ervin

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Edmond, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Cementing whipstock apparatus and methods
- Patent number 9,151,136
- Issue date Oct 6, 2015
- Smith International, Inc.
- David L. Ervin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Cementing whipstock apparatus and methods
- Patent number 8,820,437
- Issue date Sep 2, 2014
- Smith International, Inc.
- David L. Ervin
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
CEMENTING WHIPSTOCK APPARATUS AND METHODS
- Publication number 20140338908
- Publication date Nov 20, 2014
- David L. Ervin
- E21 - EARTH DRILLING MINING
Information Patent Application
CEMENTING WHIPSTOCK APPARATUS AND METHODS
- Publication number 20110253387
- Publication date Oct 20, 2011
- Smith International, Inc.
- David L. Ervin
- E21 - EARTH DRILLING MINING