ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,292, issued on June 3.
"Friction insert for oriented valve" was invented by Vianney Rabhi (Lyons, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "The friction insert for oriented valve is intended for a valve-controlled ignition prechamber and includes an external valve body guide cylindrical bearing surface which is arranged at the periphery of a valve having a guide pin and which slides with a small clearance into a first valve body guide, the insert also including an external pin guide cylindrical bearing surface which is arranged at the external periphery of an orientation pin and which slides with a small clearance into a second orientatio...