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Class Information
Number: 75/417
Name: Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures > Processes > Producing or treating free metal > At 300 degrees c or greater (e.g., pyrometallurgy, etc.) > Combined with step at less than 300 degrees c using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) > Obtaining metal from photographic waste
Description: Process wherein the source of metal is photographic waste.

Patents under this class:

Patent Number Title Of Patent Date Issued
6274045 Method for recovering and separating metals from waste streams Aug. 14, 2001
5908559 Method for recovering and separating metals from waste streams Jun. 1, 1999
5755853 Process for the treatment of solid residues containing metals, in particular residues from the cleaning of household garbage incineration smoke May. 26, 1998
5695645 Methods for removing silver from spent photoprocessing solution Dec. 9, 1997
5605632 Silver recovery device and process Feb. 25, 1997
5580905 Process for recycling polyesters Dec. 3, 1996
5395858 Process for recycling polyester Mar. 7, 1995
5064466 Non-toxic process for recovery of photographic silver Nov. 12, 1991
5008017 Method for recovering metals from waste liquors Apr. 16, 1991
4834849 Metal recovery method and apparatus May. 30, 1989
4755453 Method for recovering silver from waste solutions containing thiosulfate compounds Jul. 5, 1988
4437889 Method of recovering silver from solid and liquid photographic waste Mar. 20, 1984
4331472 Metal removal apparatus and method May. 25, 1982
4289530 Symmetrical quaternary ammonium compounds and their use in heavy metals recovery Sep. 15, 1981
4150977 Process for stripping photographic materials Apr. 24, 1979
3982932 Recovery of silver from gelatinous photographic wastes Sep. 28, 1976
3960550 Silver recovery process Jun. 1, 1976

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