William Dubilier (July 25, 1888 – 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 The Alaska–Yukon–Pacific Exposition, acronym AYP or AYPE, was a world's fair held in Seattle in 1909 publicizing the development of the Pacific Northwest. It was originally planned for 1907 to mark the 10th anniversary of the Klondike Gold R ...

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 electromagnetism, a dielectric (or dielectric medium) is an electrical insulator that can be polarised by an applied electric field. When a dielectric material is placed in an electric field, electric charges do not flow through the mate ...

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''

References

{{DEFAULTSORT:Dubilier, William 1888 births 1969 deaths 20th-century American inventors History of radio Cooper Union alumni