Patents by Inventor Roberta L. Lawson

Roberta L. Lawson 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).

  • Patent number: 5275192
    Abstract: In the Freeze Control Valve is situated a bellows that will contract at a temperature of 33 to 34 degrees F. thus triggering the valve to its position allowing the water or liquid to flow through a small discharge hole in the valve body, this in turn allows the water to heat to a higher temperature as it flows from the water line that are normally buried underground or an area that would have an above freezing temperature of 45 to 50 degrees F., the bellows at this temperature will expand, thus closing the Freeze Control Valve shutting off all exiting through the small discharge hole in the side of the valve body. When the water in the Freeze Control Valve drops again to 34 degrees F. the valve bellows repeats its action, this keeps the water from freezing.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: January 4, 1994
    Inventor: Roberta L. Lawson