ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,723,674, issued on Sept. 1, was assigned to Radon Home Defense Inc. (Stoney Creek, Canada).

"Backwater valve cover system" was invented by Christopher Dyal (Stoney Creek, Canada) and Bradley Goemans (Stoney Creek, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A backwater valve cover configured to prevent a backwater valve opening from releasing toxic soil gases into a home includes a base and a lid. The base is configured to be installed above a backwater valve. The base includes a central access opening, a first plurality of fastener holes configured to accept a first plurality of fasteners, and a second plurality of fastener holes configured t...