David Andrew Barfoot

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St. Joseph, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Indentation hardness test system
- Patent number 7,139,422
- Issue date Nov 21, 2006
- Leco Corporation
- John Michael Hauck
- G01 - MEASURING TESTING
Information Patent Grant
Indentation hardness test system
- Patent number 6,996,264
- Issue date Feb 7, 2006
- Leco Corporation
- John Michael Hauck
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
Identification hardness test system
- Publication number 20040096093
- Publication date May 20, 2004
- John Michael Hauck
- G01 - MEASURING TESTING