Title: Fix and bleach-fix bath desilvering

Abstract: Silver is removed from used fix or bleach-fix baths by adding a compound of the general formula: ##STR1## wherein: X is an oxygen atom or imino group, R is an aryl, or a group of the formula R.sub.1 CH.sub.2 (CHOH).sub.n.sub.-1 wherein n is a positive integer from 1 to 4, and R.sub.1 is either a hydrogen atom or hydroxyl group when n is 2 to 4 and is an hydroxyl group when n is 1.

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Inventors: Fisch, Richard S. (St. Paul, MN, US)
Newman, Norman (St. Paul, MN, US)

Application Number: 290972
Filing Date: 1972-09-21
Publication_date: 1977-07-26
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 430/398 75/713, 75/721, 430/400
Other Classes:
US Patent Ref:

1448475	Mar, 1923	Weisberg	75/118.
2503104	Apr, 1950	Farber	75/118.
2688548	Sep, 1954	Reynolds	96/66.
2688549	Sep, 1954	James et al.	96/66.
3700450	Oct, 1972	Cooley	96/60.

Other Refs: 1,131,096

Oct, 1968	UK

Primary Examiner: Kelley, Mary F.
Assistant Examiner:
Attorney: Alexander; Cruzan, Sell; Donald M., Litman; Mark A.