Michael Chang

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Downhole assembly releasable connection
- Patent number 6,712,146
- Issue date Mar 30, 2004
- Halliburton Energy Services, Inc.
- James W. Estep
- E21 - EARTH DRILLING MINING
Information Patent Grant
Alignable, threaded, sealed connection
- Patent number 4,907,828
- Issue date Mar 13, 1990
- Western Atlas International, Inc.
- Michael C. Chang
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Downhole assembly releasable connection
- Publication number 20030102132
- Publication date Jun 5, 2003
- James W. Estep
- E21 - EARTH DRILLING MINING