Patents by Inventor Myungsai Chung

Myungsai Chung 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).

  • 3 frequency heterodyne laser interferometer that doubles the resolution
    Patent number: 5579109
    Abstract: A 3-frequency heterodyne laser interferometer and a method for measuring length and other physical quantifies by using the interferometer are disclosed. The 3-frequency heterodyne laser interferometer includes; a 3-frequency laser oscillating means; a beam splitter for separating the output laser beams of the oscillating means into reference beams and comparison beams to measure the counted value of secondary beat frequencies; a polarizing beam splitter; first and second corner cubic prisms; first and second polarizer; first and second beam detectors; first and second amplifiers, first and second band pass filters; a 2-channel counter; and a length displaying means.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: November 26, 1996
    Assignee: Korea Research Institute of Standards and Science
    Inventors: Hosuhng Suh, Myungsai Chung