Patents by Inventor John M. Welland

John M. Welland 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).

  • Vent control for a thermal system
    Patent number: 4111643
    Abstract: A cooling vent within a thermal system, which has heat otherwise supplied to regulate the temperature thereof, is controlled to open and close incrementally so that temperature control near room ambient is facilitated.
    Type: Grant
    Filed: February 25, 1977
    Date of Patent: September 5, 1978
    Assignee: The Perkin-Elmer Corporation
    Inventor: John M. Welland