William Dubilier (July 25, 1888 in New York CityDUBILIER, William in Who's Who in America (14th edition, 1926); p. 624– July 25, 1969) was an American inventor in the field of radio and electronics. He demonstrated radio communication at Seattle's Alaska–Yukon–Pacific Exposition on June 21, 1909; ten years before the first commercial station operated. A graduate of Cooper Union, he was the first to use sheets of naturally occurring mica as the dielectric in a capacitor. Mica capacitors were widely used in early radio oscillator and tuning circuits because the temperature coefficient of expansion of mica was low, resulting in very stable capacitance – mica capacitors are still used where exceptional temperature stability is needed.
He founded the Dubilier Condenser Company in New York in 1920. His son Martin H. Dubilier also became a prominent inventor and company founder.Alison Leight Cowan (September 6, 1991) Martin Dubilier, 65, an Inventor Who Invested in Companies, Dies. New York Times
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