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:
Mar. 09, 1976
Filed:
May. 09, 1974
Applicant:
Inventor:
Ellis I Betensky, Toronto, CA;
Assignee:
Ponder & Best, Inc., Santa Monica, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350215 ; 350255 ;
Abstract
A telephoto photographic lens having internal aberration compensation and comprising an objective which is movable for focusing and a rear lens which is stationary with respect to the film plane. The rear lens has an equivalent focal length greater than that of the overall lens and may have negative power which presents a slight change in the equivalent length of the overall lens when the lens is close focused.