ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,383,432, issued on Aug. 12, was assigned to MINUENDO AS (Oslo, Norway).
"Hearing protection device" was invented by Olav Kvaloy (Oslo, Norway), Erik Swendgaard (Oslo, Norway), Odd Kr. O Pettersen (Oslo, Norway) and Hakon Aurvik (Oslo, Norway).
According to the abstract* released by the U.S. Patent & Trademark Office: "A device (1) for insertion into an ear canal of a mammalian subject. The device includes a body (2) having a sound path extending therethough and a tensioned membrane (10) in the sound path. The tensioned membrane has at least one corrugation (12). The device further includes an adjustable member (6) arranged to bear against the membrane to adjust the tension of the mem...