Douglas K. Hartz

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Clinton, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
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- Patent number 6,976,336
- Issue date Dec 20, 2005
- The Ruhlin Company
- Douglas K. Hartz
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
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- Patent number 6,848,221
- Issue date Feb 1, 2005
- The Ruhlin Company
- Douglas K. Hartz
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES

Patents Applicationslast 30 patents

Information Patent Application
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- Publication number 20050086887
- Publication date Apr 28, 2005
- The Ruhlin Company
- Douglas K. Hartz
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES