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:
Aug. 04, 1998
Filed:
Aug. 15, 1996
David Darrell Miller, Rochester, NY (US);
Paul Barrett Merkel, Rochester, NY (US);
Raymond Peter Scaringe, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Coupler dispersions comprising an aqueous medium having dispersed therein an organic phase comprising (i) a primary photographic coupler comprising a first ballasting group containing at least 5 carbon atoms and (ii) an auxiliary photographic coupler comprising a second ballasting group, wherein the primary coupler and the auxiliary coupler are present in the dispersion at a weight ratio of from 4:1 to 99:1 and the auxiliary coupler differs from the primary coupler solely in that the second ballast group contains 2 or more additional carbon atoms and associated hydrogen atoms relative to the first ballasting group. Such dispersions are substantially free from crystallization on melt holding or on cold storage, provide direct dispersions without such crystallization problems, provide cost or performance improvements by minimizing the proportion of auxiliary coupler needed to eliminate crystallization problems, and provide photographic materials of improved coatability, of lower cost, or of improved performance.