ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,195, issued on May 19, was assigned to Broan-NuTone LLC (Hartford, Wis.).

"Ventilation fan" was invented by Robert J. Woodruff (Hartford, Wis.) and Anup Nikam (Hartford, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ventilation fan having a fan housing with at least one outer wall defining an interior space, the fan housing defining an inlet and an outlet. A scroll having an outer wall defines an interior space, an inlet opening into the interior space, and an outlet spaced apart from the inlet. The scroll interior space is configured to house a fan wheel having an axis of rotation and capable of moving air from the scroll inlet to the scroll...