Patents by Inventor John W. Elder

John W. Elder 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).

  • Excess flow shutoff valve for hazardous fluids
    Patent number: 4132237
    Abstract: A shutoff valve installed on the discharge side of a pump to automatically shutoff hazardous liquid flow in the event of a rupture on the downstream side of the shutoff valve. The shutoff valve operates in response to a predetermined pressure drop across a valve and may also function to stop the driver of the pump and close the shutoff valve in response to excessive temperature conditions. Various installational arrangements may be provided in order to associate the shutoff valve with the hazardous fluid flow line.
    Type: Grant
    Filed: May 3, 1976
    Date of Patent: January 2, 1979
    Assignee: Corken Pump Company
    Inventors: Garth P. Kennedy, William A. Kennedy, Jr., Neal R. Kennedy, John W. Elder