Ernest Anderson

US Patent:

50211633, Jun 4, 1991

Filed:

Jul 25, 1990

Appl. No.:

7/559106

Inventors:

Ernest R. Anderson - Rochester NY
Dominick Vacco - Rochester NY
Thomas J. Dagon - Pittsford NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

C02F 142
C02F 170

US Classification:

210661

Abstract:

Anions containing sulfur and oxygen, e. g. thiosulfate, can be catalytically reduced using a protonated anion ion exchange resin as a catalyst. The process is preferably conducted in an aqueous system and at a pH below about 8.

US Patent:

52887286, Feb 22, 1994

Filed:

Sep 17, 1992

Appl. No.:

7/946503

Inventors:

Nathan O. Spears - Rochester NY
Ernest R. Anderson - Rochester NY
Elizabeth A. Murphy - Somers NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

C02F 162

US Classification:

210729

Abstract:

Silver is recovered from a mixture of seasoned photoprocessing solutions by contacting the solutions with a mercapto-s-triazine or water-soluble salt thereof, the mercapto-s-triazine having the formula ##STR1## wherein: R is hydrogen, --NH. sub. 4, --OH, alkyl having 1 to 8 carbon atoms, alkoxy having 1 to 8 carbon atoms, phenyl, cyclohexyl, oxazinyl, phenoxy, --NR'. sub. 2 or SR"; wherein R' is hydrogen, alkyl having 1 to 8 carbon atoms, phenyl, cyclohexyl, naphthyl or benzyl; and wherein R" is alkyl having 1 to 8 carbon atoms, phenyl, cyclohexyl, naphthyl or benzyl; m is an integer from 1 to 3; and n is 0 or an integer from 1 to 2. Using these compounds, silver ion complexes with the compound of formula I and the complex can be allowed to settle and separated from the solutions to decrease silver ion concentration in the solutions. The mixture of solutions includes a seasoned stabilizer solution and other seasoned solutions, including bleach, bleach-fix, and developer.

US Patent:

54910480, Feb 13, 1996

Filed:

Feb 21, 1995

Appl. No.:

8/391737

Inventors:

Ernest R. Anderson - Rochester NY
Stephen N. Lowery - Fairport NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 531

US Classification:

430347

Abstract:

A process for removing tin from seasoned photographic color developers containing tin as stannous or stannate complex ions, comprising the steps of: (a) collecting seasoned photographic color developer containing tin; (b) treating the collected developer with a resin having a chelating group selected from the group consisting of diphosphonic acid, amidoxime and thiol, thereby removing tin from the composition.