Patents by Inventor Sidney A. Lippiatt

Sidney A. Lippiatt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Proportioning valve with pressure port communicating with stepped area of differential piston
    Patent number: 4438980
    Abstract: A pressure reducing valve is constricted with a stepped piston affording a pressure responsive area on one side responsive to the pressure at an output port and a smaller pressure responsive area on the other side, contained between the seals of the two piston diameters and responsive to the pressure at an input port, the piston carrying a self lapping valve assembly connected via a passage to the smaller area for controlling the pressure at the output port in relation to that at the input port.
    Type: Grant
    Filed: March 23, 1982
    Date of Patent: March 27, 1984
    Assignee: Bendix Limited
    Inventor: Sidney A. Lippiatt
  • Fluid pressure operable tractor and trailer vehicle braking systems
    Patent number: 4258959
    Abstract: A tractor/trailer vehicle fluid pressure braking control system enabling two line control of trailer service and secondary braking includes for tractor braking a service brake control valve for controlling the fluid pressure applied both to service brake actuators and to a trailer service brake control line, a secondary control valve which controls the magnitude of a counteracting pressure applied to tractor spring brakes and also to a relay valve which controls a pressure in a trailer secondary spring brake control line.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: March 31, 1981
    Assignee: Bendix Westinghouse Limited
    Inventors: David J. Knight, Sidney A. Lippiatt