Siegfried Franz Gruber

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Westmont, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of making a ceramic catalytic converter open cell substrate...
- Patent number 5,731,562
- Issue date Mar 24, 1998
- General Motors Corporation
- Richard Frederick Beckmeyer
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Ceramic catalytic converter substrate
- Patent number 5,714,228
- Issue date Feb 3, 1998
- General Motors Corporation
- Richard Frederick Beckmeyer
- B28 - WORKING CEMENT, CLAY, OR STONE