Patents by Inventor John Charles Humphreys Hart

John Charles Humphreys Hart 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).

  • Valves
    Patent number: 4021016
    Abstract: The invention relates to mounting of spool and sleeve valves within a housing by mounting the sleeve by a number of diaphragm members. A spool and sleeve valve having a housing of a plurality of juxtaposed tubular members is also disclosed. The diaphragm members are formed of a synthetic plastics material.
    Type: Grant
    Filed: September 4, 1975
    Date of Patent: May 3, 1977
    Assignee: Bridon Engineering Limited
    Inventor: John Charles Humphreys Hart
  • Valves
    Patent number: 3952996
    Abstract: The invention relates to mounting of spool and sleeve valves within a housing by mounting the sleeve by a number of diaphragm members. A spool and sleeve valve having a housing of a plurality of juxtaposed tubular members is also disclosed. The diaphragm members are formed of a synthetic plastics material.
    Type: Grant
    Filed: October 4, 1974
    Date of Patent: April 27, 1976
    Assignee: Bridon Engineering Limited
    Inventor: John Charles Humphreys Hart