Patents by Inventor Gunnar D. Richardson

Gunnar D. Richardson 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).

  • Compact, linear measurement interferometer with zero abbe error
    Patent number: 4509858
    Abstract: A linear measurement interferometer 10 with a measurement axis directed toward a surface of a work piece 17 has a light source 11, a detection system 12, and a beam splitter 13 arranged to divide light from the source into test beams 21, 22, and 34 and reference beams 23, 24, and 33 that travel test and reference paths and recombine for detection by the detection system. Beam splitter 13 is arranged on the measurement axis with the work piece surface on one side of the beam splitter and the test beam path straddling the measurement axis on the opposite side of the beam splitter. A test beam retroreflector 25 mounted in the test path on the measurement axis reflects back the test beam from beam splitter 13 and is movable along the measurement axis without causing abbe error.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: April 9, 1985
    Assignee: GCA Corporation/Tropel Division
    Inventors: Robert A. Smythe, Joachim Bunkenburg, Gunnar D. Richardson