The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 1977
Filed:
Jan. 26, 1976
Copal Company Limited, Tokyo, JA;
Abstract
The light diffusing device for illumination purpose includes a light source, a thin transparent base plate having a front illuminating surface and a rear surface and arranged with its side edge adjacent to the light source so as to receive light therefrom and a light reflecting plate located adjacent to or in contact with the rear surface of the base plate. The rear surface is treated so as to have a directional light reflecting property as well as a light transmitting property so that a portion of the light received from the light source is directly emanated from the front surface of the base plate while a portion of the remainder of the light is repeatedly reflected by the rear surface and the front surface predominantly toward the opposite side edge of the base plate so as to be emanated from the front surface, the remainder of the light being reflected by the reflecting plate after passing through the rear surface, thereby permitting the light to be emanated from the front surface uniformly over the entire area thereof. The light diffusion device provides a surface illuminating device for various appliances.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile