John Keith Caulfield

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Method for pulling a crown plug
- Patent number 10,626,693
- Issue date Apr 21, 2020
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for pulling a crown plug
- Patent number 10,036,225
- Issue date Jul 31, 2018
- Tetra Technologies, Inc.
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for pulling a crown plug from a subsea tree
- Patent number 9,291,016
- Issue date Mar 22, 2016
- Tetra Technologies, Inc.
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for pulling a crown plug
- Patent number 8,869,899
- Issue date Oct 28, 2014
- Tetra Technologies, Inc.
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Grant
Guide post latching mechanism
- Patent number 5,246,075
- Issue date Sep 21, 1993
- National-Oilwell
- John K. Caulfield
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
METHOD AND APPARATUS FOR PULLING A CROWN PLUG
- Publication number 20170022774
- Publication date Jan 26, 2017
- TETRA TECHNOLOGIES, INC.
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Application
METHOD AND APPARATUS FOR PULLING A CROWN PLUG
- Publication number 20150107846
- Publication date Apr 23, 2015
- John Keith Caulfield
- E21 - EARTH DRILLING MINING
Information Patent Application
METHOD AND APPARATUS FOR PULLING A CROWN PLUS
- Publication number 20120227974
- Publication date Sep 13, 2012
- TETRA TECHNOLOGIES, INC.
- John Keith Caulfield
- E21 - EARTH DRILLING MINING