Patents by Inventor John H. Youngren

John H. Youngren 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).

  • Reflective prism assembly
    Patent number: 4875760
    Abstract: A 360.degree. reflective prism assembly comprises a mounting member having a central vertical axis and a peripheral surface portion that defines an outer horizontal boundary of the mounting member. A plurality of spaced apart reflecting prisms are arranged around the mounting member and attached thereto at or near the peripheral surface portion thereof. The prism assembly is used with electronic distance meters for measuring the distance between the assembly and meter locations surround the assembly.
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: October 24, 1989
    Inventors: John H. Youngren, David J. Youngren