Patents by Inventor John S. Singleton

John S. Singleton 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).

  • Universal sundial
    Patent number: 4922619
    Abstract: A sundial has a scale 3 on the inner face of a single-turn helix 1, and a gnomon 2 which is a rod or wire lying along its axis. The scale is linear and the instrument can be used at substantially any location, regardless of latitude or longitude. It can be advanced for statutory Summer Time, and adjusted to compensate for non-linearity in the sun's apparent movement (`Equation of Time`).
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: May 8, 1990
    Inventor: John S. Singleton