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. 25, 1977
Filed:
Mar. 21, 1975
Roy L Orvis, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Photographic elements containing at least one silver halide emulsion layer in which there is incorporated a cyan-color forming material which, upon reaction with oxidized color developer, forms a cyan dye having unwanted absorption in the green and blue regions of the visible spectrum can be color corrected to a surprising degree by the incorporation into said element of a colored coupler compound having the structure: ##STR1## wherein R.sup.2 is an alkyl group containing 1 to 6 carbon atoms, R.sup.3 and R.sup.4 are independently selected and are alkyl groups containing 2 to 6 carbon atoms, B is hydrogen or CooR.sup.6 wherein R.sup.6 is an alkyl group containing 1 to 8 carbon atoms, and A is a sulfonated naphthylazo group selected from those having the structure: ##STR2## wherein R.sup.5 is an alkyl group containing 1 to 4 carbon atoms, M is photographically inactive, M is a monovalent cation.