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:
Jul. 03, 1984
Filed:
Dec. 03, 1981
Applicant:
Inventor:
James G Baker, Bedford, NH (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350432 ; 350465 ;
Abstract
A five element photographic objective including four elements fixed in a generally symmetric arrangement and a transversely movable refracting plate of preferred shape for maintaining the focal setting of the objective over a large range of object distances. One of the four fixed elements and the refracting plate each include at least one surface whose shape is in a nonrotational aspheric and mathematically describable by a polynomial of at least fifth order.