EP 1198623 B1 20030319 - METHOD FOR PRODUCING A CYANIDE-FREE SOLUTION OF A GOLD COMPOUND THAT IS SUITABLE FOR GALVANIC GOLD BATHS
Title (en)
METHOD FOR PRODUCING A CYANIDE-FREE SOLUTION OF A GOLD COMPOUND THAT IS SUITABLE FOR GALVANIC GOLD BATHS
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER CYANIDFREIEN, FÜR GALVANISCHE GOLD-BÄDER GEEIGNETEN GOLDVERBINDUNGSLÖSUNG
Title (fr)
PROCEDE POUR PRODUIRE UNE SOLUTION DE COMPOSE D'OR SANS CYANURE, ADAPTEE A DES BAINS DE PLACAGE D'OR GALVANIQUES
Publication
Application
Priority
- DE 19924895 A 19990601
- EP 0004368 W 20000516
Abstract (en)
[origin: WO0073540A1] The invention relates inter alia to a method for producing a cyanide-free solution of a gold compound that is suitable for galvanic gold baths. Said method comprises the following steps: a) reacting a cysteine and/or a cysteinate with a tetrachloroauric acid and/or a tetrachloroauric salt in a first aqueous medium; b) separating the resulting precipitate from the first aqueous medium; and c) dissolving said precipitate in a second aqueous medium, increasing the pH value to 12.0 to 14.0.
IPC 1-7
IPC 8 full level
C25D 3/48 (2006.01)
CPC (source: EP US)
C25D 3/48 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0073540 A1 20001207; WO 0073540 A8 20010913; AT E234949 T1 20030415; DE 19924895 A1 20010510; DE 19924895 B4 20040325; DE 50001514 D1 20030424; EP 1198623 A1 20020424; EP 1198623 B1 20030319; ES 2193959 T3 20031116; JP 2003500550 A 20030107; US 6733651 B1 20040511
DOCDB simple family (application)
EP 0004368 W 20000516; AT 00929531 T 20000516; DE 19924895 A 19990601; DE 50001514 T 20000516; EP 00929531 A 20000516; ES 00929531 T 20000516; JP 2001500023 A 20000516; US 98096801 A 20011219