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:
Dec. 14, 1976
Filed:
Dec. 20, 1973
Applicant:
Inventor:
Eiichi Takano, Tokyo, J;
Assignee:
Canon Kabushiki Kaisha, Tokyo, J;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350184 ;
Abstract
A zoom lens comprising a convergent lens group as a focusing lens, a movable divergent lens group as a variator lens, a compensator lens group and a relay lens group being positioned in said order from an object side, wherein the interval between the principal point of said convergent lens group and the principal point of said divergent lens group is 70% to 130% of the absolute value of the focal distance taken by said divergent lens group when the focal distance of the total system is the minimum.
Takano, Eiichi. (1976). Zoom lens having well-compensated distortion (U.S. Patent No. 3997244). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3997244
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile