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, 1982
Filed:
Nov. 13, 1980
Paolo Beretta, Ferrania, IT;
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
It is desirable to protect color photographic dye images from ultraviolet radiation which tends to cause dyes to fade. It has been the practice in the art to add materials into or above the silver halide emulsions which will absorb ultraviolet radiation but allow transmission of visible radiation. One of the best classes of compounds are the 2-(2'-hydroxyphenyl)-benzotriazoles. These materials absorb ultraviolet radiation well, but tend to have poor solubility, crystallize out of the coating solution and emulsion, and diffuse through the photographic element. A novel class of substituted 2-(2'-hydroxyphenyl)-benzotriazoles has been found to reduce many of these problems.