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. 12, 1991
Filed:
Oct. 18, 1989
Applicant:
Inventors:
Seiji Nishiwaki, Katano, JP;
Yoshinao Taketomi, Moriguchi, JP;
Shinji Uchida, Osaka, JP;
Takaaki Tomita, Moriguchi, JP;
Taketoshi Yonezawa, Ibaraki, JP;
Sadao Mizuno, Ibaraki, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G11B / ;
U.S. Cl.
CPC ...
350 9619 ; 350 9611 ; 350 9612 ; 3501622 ; 35016221 ; 35016223 ; 2502015 ; 369 4412 ; 369 4414 ;
Nishiwaki, Seiji. (1991). Optical head apparatus including concentric, periodic grating in a (U.S. Patent No. 4991919). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4991919
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile