ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,558,701, issued on Feb. 24, was assigned to Graco Minnesota Inc. (Minneapolis).
"Back pressure regulator" was invented by Jason J. Willoughby (Golden Valley, Minn.), Timothy S. Roman (Minnetonka, Minn.), David C. Polovitz (Medina, Minn.) and Willem M. Tieleman (Minneapolis).
According to the abstract* released by the U.S. Patent & Trademark Office: "A back pressure regulator ("BPR") includes a pressure housing that at least partially defines a flow chamber that the liquid flows through and the BPR has an adjustable restriction that varies with the flow rate to maintain an upstream liquid pressure. The pressure housing is contoured to distribute the liquid flow to provide radial flow ...