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:
Jun. 20, 2000
Filed:
Aug. 11, 1998
Charles M Darmon, Spencerport, NY (US);
Jean M Buongiorne, Brockport, NY (US);
Michael J Haight, Rochester, NY (US);
Paul A Schwartz, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from about 15:85 to about 50:50. This composition is prepared in a unique manner, namely by combining the noted components, and removing the sulfate anions commonly present in color developing agents by precipitation with alkali metal ions, before addition of further components. The concentrate can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution.