Michael F. Welsh

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Dual metal face seal with single recessed energizer
- Patent number 5,360,076
- Issue date Nov 1, 1994
- Hughes Tool Company
- Joseph L. Kelly
- E21 - EARTH DRILLING MINING
Information Patent Grant
Earth boring bit with improved thrust bearing
- Patent number 5,307,887
- Issue date May 3, 1994
- Baker Hughes Incorporated
- Michael F. Welsh
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock bit with rigid face seals and recessed energizers
- Patent number 4,923,020
- Issue date May 8, 1990
- Hughes Tool Company
- Joseph H. Kelly
- E21 - EARTH DRILLING MINING
Information Patent Grant
Earth boring bit with improved two piece bearing and seal assembly
- Patent number 4,903,786
- Issue date Feb 27, 1990
- Hughes Tool Company
- Michael F. Welsh
- E21 - EARTH DRILLING MINING