ALEXANDRIA, Va., Feb. 5 -- United States Patent no. 12,215,807, issued on Feb. 4, was assigned to Advanced Couplings Ltd. (Keighley, Great Britain).
"In-line sight glass kit and assembly" was invented by Keith James Kendrick (Shipley, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "This specification discloses an in-line sight device sealed of a transparent tube surrounded by a tube body having a window. The tube body is attached to at least one flange via an attachment device which avoids any torque on the seal gasket. The flange and tube body are in direct contact with each other and the seal gasket is between the transparent tube and the flange having pressure applied in the same fixed volume...