ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,698,016, issued on Aug. 4, was assigned to NATIONAL STEEL CAR Ltd. (Hamilton, Canada).
"Railroad car truck damper wedge fittings" was invented by Jamal Hematian (Burlington, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "A damper wedge for a railroad car truck includes a friction member that rides on the wear plate of the side frame column of the railroad car truck and a non-metallic wear surface; and a spring seat that, in use, engages a spring of the railroad car truck. The inclined damper wedge surface has a primary angle alpha, and a secondary angle beta. The spring seat has an axial centerline. The inclined damper wedge surface has a curvatur...