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:
May. 12, 1981
Filed:
Aug. 30, 1979
Kiyoshi Hayashi, Yokohama, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
A wide angle zoom lens system capable of photographing objects from infinity to a close distance while maintaining an excellent image-forming performance employs a first group which is a divergent lens group having a focusing function, and a second group which is a convergent lens group disposed rearwardly of the first group. The first group includes a divergent forward portion and a convergent rearward portion disposed with a predetermined spacing from the forward portion, the forward and rearward portions being movable relative to one another for focusing. The first and second groups are movable relative to each other to effect a magnification change.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile