Patents by Inventor Terry E. Richards

Terry E. Richards 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).

  • Thermally operated propeller assembly
    Patent number: 4487193
    Abstract: A temperature indicating propeller assembly comprises first and second propellers freely suspended one above the other on a common suspension wire for rotation by rising air currents. One propeller is of larger diameter than the other so that it commences rotation by air currents generated at lower temperatures than the other propeller. The assembly can be suspended over a domestic stove, for example, to indicate when the stove is operating at normal temperature by rotation of the one propeller, or when the stove is operating at an excessive temperature by rotation of both propellers.
    Type: Grant
    Filed: October 19, 1983
    Date of Patent: December 11, 1984
    Inventors: Terry E. Richards, Janet A. Richards