John L. Bernard

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Flapper valve
- Patent number 9,745,822
- Issue date Aug 29, 2017
- Baker Hughes Incorporated
- John L. Bernard
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
FLAPPER VALVE
- Publication number 20160273306
- Publication date Sep 22, 2016
- BAKER HUGHES INCORPORATED
- John L. Bernard
- E21 - EARTH DRILLING MINING