Patents by Inventor John A. B. Castell

John A. B. Castell 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).

  • Spray nozzle holder containing two valves for flow control
    Patent number: 5441203
    Abstract: A spray nozzle holder (1) has an inlet (12) through which liquid to be sprayed is admitted and an outlet (14) for passing liquid to a nozzle tip attached in use to the holder. A check valve (50,51,52) is positioned between the inlet (12) and the outlet (14) for preventing liquid flow when the liquid pressure is below a predetermined level. A further valve (20,23,24,26) is provided to prevent liquid flow to the outlet (14) during removal or maintenance of the check valve (50,51,52).
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: August 15, 1995
    Assignee: Lurmark Limited
    Inventors: Trevor W. B. Swan, John A. B. Castell