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:
Jan. 22, 1985
Filed:
Apr. 08, 1982
Hisayuki Masumoto, Sakai, JP;
Shuji Ogino, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A zoom lens system of a relatively high zoom ratio ranging from a telephoto to a wide field angle is provided. The zoom lens system comprises from the object to the image side a first lens group of a positive refractive power, a second lens group of a negative refractive power consisting of a first negative subgroup, a second positive subgroup located on the image side of the first negative subgroup with an air space and a third negative subgroup located on the image side of the second positive subgroup with an air space, and a third lens group of a positive refractive power, wherein at least the air space between the first and second lens groups and the air space between the second and third lens groups are changeable upon zooming. The focusing can be practiced by moving the first lens group with the other lens groups left stationary.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile