Patents by Inventor Kyouji Imagawa

Kyouji Imagawa 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).

  • Method of and apparatus for measuring birefringence
    Patent number: 5450200
    Abstract: A part for projecting a measuring light beam onto a sample and a light receiving part are arranged on the same side of a sample surface so that the measuring light beam is concentric with the light receiving part, the measuring light beam which is converted to a linearly polarized light beam through a polarizing element is projected to the sample so that the measuring light beam outgoing from the sample to the projecting side is received and detected through the same polarizing element. A plurality of sets of polarizing elements and light receiving parts are set so that the polarizing elements have different polarization directions, to calculate retardation from transmitted light intensity levels as obtained.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: September 12, 1995
    Assignee: New Oji Paper Co., Ltd.
    Inventors: Kyouji Imagawa, Kiyokazu Sakai