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:
Sep. 26, 1989
Filed:
Jan. 13, 1989
Applicant:
Inventors:
Takayuki Tsuboi, Kanagawa, JP;
Isao Nakazawa, Kanagawa, JP;
Hiroshi Maeno, Tokyo, JP;
Yasuhiko Shiomi, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G02B / ;
U.S. Cl.
CPC ...
35419512 ; 350429 ;
Abstract
A focal length varying device for a camera comprises a photo taking optical system having a variable focal length; a discriminating device for discriminating whether or not adequate photographing is possible; and a system for automatically changing the focal length of the photo taking optical system on the basis of the result of discrimination made by the discriminating device.
Quick Actions:
Tsuboi, Takayuki. (1989). Focal length varying device for camera (U.S. Patent No. 4870439). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4870439
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile