Patents by Inventor Doris S. Kramer

Doris S. Kramer 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).

  • Refrigeration evaporators with ice detectors
    Patent number: 4037427
    Abstract: A refrigeration evaporator with a drain pan which contains a heated temperature sensitive element for distinguishing between the abnormal condition of water or ice in the drain pan and the normal condition of cold air there. The distinguishing action of the element takes place because the heated element is warmer in the presence of air than in the presence of moisture. An alarm or signal, for alerting operating or service personnel, responds to the temperature of the sensor.
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: July 26, 1977
    Inventor: Doris S. Kramer