Waldo L. Semon — Infoplease.com

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Health and Science > Inventions and Discoveries > The National Inventors Hall of Fame

Waldo L. Semon

Born: 1898
Birthplace: Demopolis, Ala.

PVC plastisols—Semon's work turned polyvinyl chloride (PVC), first considered worthless, into the world's second-best selling plastic. He also provided the technical leadership that led to the discovery of thermoplastic polyurethane, synthetic “natural” rubber, and the first oil-resistant synthetic rubber. (1995)

Robert J. Seiwald

The National Inventors Hall of Fame

Claude Shannon

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