Patents by Inventor John Spearen

John Spearen 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).

  • Method and apparatus for determining spring preloading in a fluid handling device
    Patent number: 4607421
    Abstract: Required preloading of a valve closing spring (80) in a pressure operated, fluid handling device (10) is determined by mechanically precompressing the spring, applying operating pressure to the device and relieving the bias on the spring until the operating pressure opens the valve, the thickness of a shim (75) for effecting such preloading being equal to the difference between the change in spring length due to the precompression thereof and the change in spring length due to relief of the precompression prior to spring opening.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: August 26, 1986
    Assignee: United Technologies Corporation
    Inventors: Thomas G. Zemek, Antonio B. Caruolo, Stephanie A. Roberts, James K. Dunn, John Spearen