United States Patent (19) 11 Patent Number: 4,965,177 Mclaen (45) Date of Patent: Oct
United States Patent (19) 11 Patent Number: 4,965,177 McLaen (45) Date of Patent: Oct. 23, 1990 (54) ACTIVATORSOLUTION WITH COLD IMAGE TONE-PROVIDING AGENT OTHER PUBLICATIONS G. Haist, Modern Photographic Processing, vol. 1, 75 Inventor: Donald F. McLaen, Rochester, N.Y. 1979, pp. 260-262, John Wiley and Sons, N.Y. 73) Assignee: Eastman Kodak Company, B/W Print Processing with the Kodak Royalprint Rochester, N.Y. Processor, 1980. 21 Appl. No.: 388,412 Operating the Kodak Royalprint Processor Model 417, Nov., 1984. 22 Filed: Aug. 2, 1989 Maintaining the Kodak Royalprint Processor Model 51 Int. Cl. ................................................ CO3C 5/29 4.17, Nov., 1984. 52 U.S. C. .................................... 430/405; 430/448; Primary Examiner-Paul R. Michi 430/486; 430/.490 Assistant Examiner-Janet C. Baxter 58) Field of Search ............... 430/405, 448, 486, 490, 430/965 Attorney, Agent, or Firm-Robert A. Linn 57 ABSTRACT (56) References Cited Potassium iodide (or a related iodide) when incorpo U.S. PATENT DOCUMENTS rated in an alkaline activator for use in a rapid access 2,607,686 8/1952 Current ............................... 430/370 processor using developer-incorporated, resin-coated 3,55,555 6/1970 Fassbender ......................... 430/370 paper, (i) produces a cold image tone in black-and-white 3,619,186 11/1971 Parsons ............................... 430/232 photographic prints, and (ii) maintains the image tone of 4,124,390 1 1/1978 Kohn ................................... 430/390 a large number of prints within a narrow image tone 4,436,805 3/1984 Iguchi et al. ........................ 430/248 range over a (one week or one thousand 8X 10 inch FOREIGN PATENT DOCUMENTS print) design life of the activator solution.
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