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

Frederick G. Cottrell

Born: 1877
Birthplace: Oakland, Calif.

Electrostatic precipitator—Cottrell's invention used high voltage electricity to remove from 90 to 98% of the ash, dust, and acid which industrial smokestacks spewed into the air. Besides eliminating this particulate pollution, this process also allowed some of the minerals and chemicals to be re-used. (1992)

Died: 1948

Harry Coover

The National Inventors Hall of Fame

Wallace Coulter