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:
Apr. 11, 1989
Filed:
Dec. 24, 1985
Applicant:
Inventors:
Shigeyuki Suda, Tokyo, JP;
Takeshi Baba, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
350423 ; 350429 ;
Abstract
A zoom lens having a plurality of lens units at least one of which includes a variable refractive index element for zooming and focusing purpose. The refractive index of the variable refractive index element of the zoom lens is varied by an output from an auto-focus detection device.
Suda, Shigeyuki. (1989). Zoom lens with a variable refractive index element (U.S. Patent No. 4820028). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4820028
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile