Patents by Inventor Thomas Duerst

Thomas Duerst 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).

  • Bow sight
    Patent number: 4325190
    Abstract: A bow sight for determining proper range includes an energy source and a series of mercury tilt switches, each of which becomes operable at a different predetermined angle of bow inclination. A series of light emitting sight pins are connected to the tilt switches via an electronic circuitry that allows for the energization of a different sight pin for a different angle of bow inclination.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: April 20, 1982
    Inventor: Thomas Duerst