David J. Derwin

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Prospect Heights, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Electrically conductive pavement mixture
- Patent number RE43044
- Issue date Dec 27, 2011
- Superior Graphite Co.
- Peter L. Zaleski
- 404 - Road structure, process, or apparatus
Information Patent Grant
Electrically conductive pavement mixture
- Patent number 6,971,819
- Issue date Dec 6, 2005
- Superior Graphite Co.
- Peter L. Zaleski
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES