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. 03, 1998
Filed:
Dec. 22, 1995
Gary Norman Barber, Penfield, NY (US);
Margaret Jones Helber, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Silver halide light sensitive photographic elements comprising a support bearing on one side thereof at least one blue-sensitive silver halide emulsion yellow-image forming layer, at least one red-sensitive silver halide emulsion cyan-image forming layer, at least one green-sensitive silver halide emulsion magenta-image forming layer, and an antihalation layer comprising a cyan filter dye coated between the support and the red-sensitive layer, wherein the green-sensitive layer comprises a four equivalent magenta image forming coupler and the cyan filter dye is of the formula (I): ##STR1## where L.sup.1, L.sup.2, L.sup.3, L.sup.4 and L.sup.5 are methine groups; R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently H or alkyl or aryl groups; and M.sup.+ is H or a counter ion; wherein at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 comprises an aryl group substituted with a substituent having a .pi. value of less than -0.10, where .pi. represents the group substituent component of the hydrophobicity parameter logP. In a preferred embodiment of the invention, R.sup.3 and R.sup.4 are each H, and R.sup.1 and R.sup.2 are each phenyl groups substituted with one or more substituents, where the sum of the .pi. values for the substituents on each of the R.sup.1 and R.sup.2 phenyl groups is less than -0.10 at pH above 8. Photographic elements in accordance with the invention exhibit reduced dye stain after photographic processing, resulting in lower red minimum densities. Such elements also exhibit higher maximum densities, upper scale contrasts, and relative speeds compared to prior art materials. Elements in accordance with preferred embodiments of the invention exhibit improved safelight performance.