Patents by Inventor Kimio Oku

Kimio Oku 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).

  • Optical instrument for producing artificial rainbows
    Patent number: 5146364
    Abstract: This invention is directed to an optical instrument including a prism and a convex reflective surface for producing artificial rainbows which is used for a display in halls of entertainment as well as in shops and for interior decoration. Comparatively small optical instruments can also be used as a toy.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: September 8, 1992
    Inventor: Kimio Oku