John Robert GRADISHAR

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Retractable joint and cementing shoe for use in completing a wellbore
- Patent number 7,730,965
- Issue date Jun 8, 2010
- Weatherford/Lamb, Inc.
- John Christopher Jordan
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
METHOD OF CONTROLLING PRESSURE IN A WELL
- Publication number 20130105176
- Publication date May 2, 2013
- Shell Oil Company
- John Robert GRADISHAR
- E21 - EARTH DRILLING MINING
Information Patent Application
CURVED STRUCTURAL PIPE SHOE
- Publication number 20110259644
- Publication date Oct 27, 2011
- Shell Oil Company
- John Robert GRADISHAR
- E21 - EARTH DRILLING MINING