Patents Examined by Derke D Knight
  • Hydraulic clutch control system
    Patent number: 8348797
    Abstract: A transmission includes two blocking valves that control fluid pressure to a plurality of clutches. The blocking valves are characterized by a plurality of states that result in at least three transmission operating conditions. Each of the three operating conditions is characterized by fluid pressure being unavailable to a respective one of the plurality of clutches.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: January 8, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Michael D. Foster, Jy-Jen F. Sah, Peter E. Wu