Patents by Inventor Kee-Ju Choi

Kee-Ju Choi 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).

  • Noninvasive method and apparatus using coherent backscattering for process control
    Patent number: 5063301
    Abstract: A method and apparatus for the noninvasive real-time characterization of samples using coherent backscattering is disclosed. The sample is illuminated by a laser, and the radiation that is coherently backscattered is measured. The line width or line shape of the coherent backscattered radiation, or in some cases just the existence of coherent backscatter, is then used to characterize the sample under test. This characterization is then used for the real time control of a process acting upon the sample.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: November 5, 1991
    Assignee: The Standard Oil Company
    Inventors: Leonid A. Turkevich, Kee-Ju Choi