ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,233,292, issued on Feb. 25, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).
"Anti-fog respirator" was invented by John M. Facer (Langley Park, Great Britain), Audra A. Wilson (Gateshead, Great Britain) and Christopher P. Henderson (High Shincliffe, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A respirator that includes a harness and a mask body that is air permeable. The mask body has a sinus region and a primary filtering region and comprises at least one nonwoven fibrous webs The sinus region of the mask body exhibits a resistance to airflow that is greater than the primary filtering region. This resistance to airflow i...