Patents Assigned to David S. Ward
  • Tilt valve carburetor for gaseous fuel systems
    Patent number: 4997458
    Abstract: An air/gaseous fuel proportioning device includes an air inlet, a fuel inlet, an outlet to feed an air fuel blend to an engine, with the air inlet having an air butterfly valve to throttle the air flow, having a disc-shaped fuel valve resting in a conical bore and having a linkage attached to the air butterfly valve for causing the fuel valve to follow the air butterfly valve in a tilting motion to provide an open area between the disc and cone that relates proportionally to the air flow past the air butterfly valve.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: March 5, 1991
    Assignee: David S. Ward
    Inventor: James S. Jones