Patents by Inventor Frank E. Swindells

Frank E. Swindells 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).

  • Irreversible warmup indicator
    Patent number: 4120818
    Abstract: A device for indicating irreversibly by means of color change that temperres equal to or above 7.degree. C, 10.degree. C, or 13.degree. C have occurred. A container which has an orifice therein is filled with a liquid which freezes at the temperature to be monitored. A dye is dissolved in the liquid. The orifice is placed in proximity to an indicating paper. When the container is activated by freezing, any increase in temperature after activation causes the liquid to melt, expand and escape through the orifice contacting the indicating paper thereby dying the paper and producing an irreversible signal.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: October 17, 1978
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Frank E. Swindells, Mary G. Klimas