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. 16, 1980
Filed:
Oct. 02, 1978
Shuji Ogino, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A conversion lens system to be attached to an objective lens system at the image side thereof for converting the focal length of the objective lens system into a greater value is provided. The conversion lens system has a negative focal length and comprises seven single lens elements consisting of a first negative meniscus lens element convex to the object side, a second biconvex lens element, a third biconcave lens element, a fourth biconvex lens element, a fifth negative lens element having a concave front surface, a sixth positive lens element having a convex rear surface and a seventh biconcave lens element. All of the seven lens elements may be separated from the others, or alternatively, at least two of the second to fourth lens elements may be cemented to each other.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile