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:
Apr. 06, 1976
Filed:
Aug. 02, 1973
Applicant:
Inventors:
Reinhold Deml, Munich, DT;
Ulrich Greis, Weyarn, DT;
Assignee:
AGFA-Gevaert, A.G., Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; G03C / ;
U.S. Cl.
CPC ...
96 383 ; 96 2 / ; 96 2 / ; 350178 ; 350211 ;
Abstract
In a method of forming a Fresnel lens from a body of light-sensitive material of the type which undergoes changes in its optical path-length when exposed to light, the step of exposing each portion of such body of light-sensitive material to light to the extent necessary to impart to the respective portion the optical path-length requisite for the corresponding portion of the Fresnel lens to be formed.