ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,704,136, issued on Aug. 11, was assigned to Allison Transmission Inc. (Indianapolis).
"Technologies for variable retarder control" was invented by Upkar Ubhi (Greenwood, Ind.), Kurt Biehl (Lebanon, Ind.) and Evan Meredith (Indianapolis).
According to the abstract* released by the U.S. Patent & Trademark Office: "Technologies for variable retarder control include a control valve for controlling operation of a hydraulic retarder. The control valve includes a valve body having a retarder valve including multiple ports and a valve bore extending through the ports. A valve spool is located in the valve bore and movable to selectively block or connect one or more of the ports. The ports in...