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. 26, 1991
Filed:
Jul. 22, 1988
Applicant:
Inventor:
Muneharu Sugiura, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350427 ; 350450 ;
Abstract
A photographic lens including a plurality of lenses on the image plane side of an aperture stop for determining values of the F-number, wherein stray light reflected, in turn, from a predetermined image plane or thereabout and each lens surface is prevented from taking a focus at so near a position to the predetermined image plane as to deteriorate the image quality.
Sugiura, Muneharu. (1991). Photographic lens free from forming of ghost image (U.S. Patent No. 4995708). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4995708
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile