US Patent Issued to Sennheiser electronic on Aug. 4 for "Electret microphone" (German Inventors)

ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,701,367, issued on Aug. 4, was assigned to Sennheiser electronic SE & Co. KG (Wedemark, Germany).

"Electret microphone" was invented by Stephan Leschka (Potsdam, Germany) and Wolfgang DreBler (Berlin).

According to the abstract* released by the U.S. Patent & Trademark Office: "An electret microphone includes a microphone capsule with an output connection, a first input connection as an earth connection and a second input connection for providing a supply voltage and for leading out a microphone output signal. A cascode includes first and second transistors, wherein the microphone capsule's output is input to the cascode. The second transistor is an FET having a gate coupled to the mic...