David J. Margraf

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Braunfels, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Piezoelectric viscometer
- Patent number 4,799,378
- Issue date Jan 24, 1989
- Alcor, Inc.
- Joseph L. Portman
- G01 - MEASURING TESTING
Information Patent Grant
Piezoelectric weighing device
- Patent number 4,697,657
- Issue date Oct 6, 1987
- Joe L. Portman
- G01 - MEASURING TESTING
Information Patent Grant
Piezoelectric ratio weighing device
- Patent number 4,623,030
- Issue date Nov 18, 1986
- Alcor, Inc.
- Joe L. Portman
- G01 - MEASURING TESTING