Frederick Cottrell

Frederick Cottrell was an American physical chemist who invented the electrostatic precipitator in 1907. This groundbreaking device utilizes electrical charges to capture and remove particulate matter—such as dust, smoke, and acid mist—from industrial exhaust streams. His invention remains a foundational technology in modern pollution control today.

The device works by applying a high-voltage electrical charge to electrodes, which then transfers a negative charge to the particles in the passing smoke or exhaust gas. These charged particles are subsequently drawn to and collected on oppositely charged metal plates. By periodically shaking or washing the plates, the accumulated pollution can be safely removed before it enters the atmosphere.

At the turn of the 20th century, industrial emissions from factories, smelters, and power plants were causing severe environmental damage and public health crises. Cottrell's invention allowed heavy industries to clean their exhaust fumes, drastically reducing acid rain and smog. It was particularly crucial for stopping the corrosive sulfuric acid mist emitted by chemical manufacturing plants.

Rather than keeping the vast profits for himself, Cottrell used the proceeds from his electrostatic precipitator patents to establish the Research Corporation for Science Advancement in 1912. This foundation was designed to fund scientific research and patent the inventions of university scientists. It became a vital source of funding for American scientific innovation throughout the 20th century.