David R. Lewis

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Canfield, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Sheet-metal highway guardrail system
- Patent number 6,502,805
- Issue date Jan 7, 2003
- David R. Lewis
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Roadway energy absorbing impact attenuator
- Patent number 6,454,488
- Issue date Sep 24, 2002
- David Lewis
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES

Patents Applicationslast 30 patents

Information Patent Application
Sheet-metal highway guardrail system
- Publication number 20020088967
- Publication date Jul 11, 2002
- David R. Lewis
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES