Patents by Inventor Ralph W. Zimmerman

Ralph W. Zimmerman 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).

  • Thermostat range limit device
    Patent number: 5550524
    Abstract: An adjustable thermostat range limit apparatus consists of a base member having a pair of adjustable temperature limit means. The thermostat range limit apparatus is attached in the proximity of a conventional thermostat so that the adjustable temperature limit means can come into contact with the temperature control level of a conventional thermostat. These adjustable temperature limit means will provide for a restriction in the temperature range in which the temperature control lever can be set.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: August 27, 1996
    Inventor: Ralph W. Zimmerman