Patents by Inventor Darhl R. Worrell

Darhl R. Worrell 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).

  • Low temperature alarm
    Patent number: 4801922
    Abstract: An alarm device has a housing provided with visual and audio alarm indicators which give a warning when the temperature of a particular location is at a predetermined relatively low temperature to prevent freezing and wherein a modification is provided which has a switch that activates an enhanced audio alarm responsive to a predetermined temperature lower than the first referred to temperature.
    Type: Grant
    Filed: May 14, 1987
    Date of Patent: January 31, 1989
    Inventors: Darhl R. Worrell, George Spector