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:
Feb. 17, 1998
Filed:
Aug. 25, 1994
Applicant:
Inventors:
Ikuo Katoh, Yokohama, JP;
Kiyoshi Yokomori, Yokohama, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385129 ;
Abstract
An optical integrated circuit for preventing unnecessary optical waves from outside or scattered in a waveguide. The optical integrated circuit has an substrate, a wave guide which has a core layer and at least a clad layer formed on the substrate, in which an optical wave is guided and transmitted, and a cover layer of which material has a high optical wave absorption ratio, which is formed on the waveguide partially or entirely.