Patents by Inventor Richard Douglas Curtis

Richard Douglas Curtis 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).

  • Temperature-responsive shut-off for gas fuel regulator valve
    Patent number: 4099538
    Abstract: Fusible low-temperature alloy is used to secure a flanged sleeve to an adjusting stem which adjusts the tension on a spring-biased diaphragm which actuates a normally-closed valve. If a predetermined temperature is reached, the alloy melts, displacing the sleeve and removing the compressive force on the spring, thereby closing the valve.
    Type: Grant
    Filed: March 3, 1977
    Date of Patent: July 11, 1978
    Assignee: The Coleman Company, Inc.
    Inventor: Richard Douglas Curtis