Patents by Inventor Yoshizi Kawamura

Yoshizi Kawamura 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).

  • Beam splitter
    Patent number: 4627688
    Abstract: A beam splitter comprises a transparent substrate having a refractive index N.sub.S, at least one low refractive index film layer having a refractive index N.sub.L higher than N.sub.S, and at least one high refractive index film layer having a refractive index N.sub.H higher than N.sub.L. The low refractive index film layer and the high refractive index film layer are alternately stacked on the substrate so that the lowermost film layer and the uppermost film layer of the stack are the low refractive index film layer, or the lowermost film layer is the high refractive index film layer and the uppermost film layer is the low refractive index film layer.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: December 9, 1986
    Assignee: Sano Kiko Co., Ltd.
    Inventors: Takeshi Kobayashi, Kazuo Endo, Nobumasa Nanbu, Yoshizi Kawamura