ALEXANDRIA, Va., July 16 -- United States Patent no. 12,357,136, issued on July 15, was assigned to Milwaukee Electric Tool Corp. (Brookfield, Wis.).

"Portable dust extractor" was invented by Jonathan M. Mantes (Franklin, Wis.) and Fraizier Reiland (Myrtle Beach, S.C.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A portable dust extractor is disclosed and includes a housing, a collection chamber in the housing, a first filter chamber in the housing and in fluid communication with the collection chamber, wherein a first filter is disposed within the first filter chamber, a second filter chamber in the housing and in fluid communication with the collection chamber, wherein a second filter is disposed within t...