ALEXANDRIA, Va., July 30 -- United States Patent no. 12,375,860, issued on July 29, was assigned to Freedman Electronics Pty Ltd. (Silverwater, Australia).
"Electret capsule" was invented by Peter Freedman (Silverwater, Australia) and Pieter Schillebeeckx (Silverwater, Australia).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates generally to the field of electret capsule, and more particularly to a circuit configuration of an impedance converter integrated in an electret capsule such as for use in condenser microphones. The electret capsule of a microphone may include a gate biasing field effect transistor (FET) to facilitate biasing of a low noise FET. Advantageously, the use of lo...