Patents by Inventor Muneo Momozawa

Muneo Momozawa 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).

  • Sign illumination system and method
    Patent number: 5818640
    Abstract: This relates to a system for and method of illuminating a sign, so that drivers and observers may easily recognize and read the sign and billboard. The apparatus employs an external illumination source that is easy to inspect and maintain. The illumination source and the sign or billboard are separately installed from each other. Light emitted from the illumination source forms an incident angle (.theta.) in the range of 0.degree. to about 30.degree. at any point on the road sign. A road sign area of the sign is made of a retroreflective sheet having a wide observation angle.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: October 6, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Yoshio Watanabe, Toshitaka Nakajima, Muneo Momozawa, Satoshi Kakishita