Global Patent Index - EP 0873435 B1

EP 0873435 B1 2000-03-29 - PROCESS FOR MAINTAINING A CONSTANT CONCENTRATION OF SUBSTANCES IN AN ELECTROPLATING BATH

Title (en)

PROCESS FOR MAINTAINING A CONSTANT CONCENTRATION OF SUBSTANCES IN AN ELECTROPLATING BATH

Title (de)

VERFAHREN ZUR AUFRECHTERHALTUNG KONSTANTER KONZENTRATIONEN VON IN EINEM GALVANOTECHNISCHEN BEHANDLUNGSBAD ENTHALTENEN STOFFEN

Title (fr)

PROCEDE DE MAINTIEN DE CONCENTRATIONS CONSTANTES DE SUBSTANCES CONTENUES DANS UN BAIN DE TRAITEMENT GALVANOPLASTIQUE

Publication

EP 0873435 B1 (DE)

Application

EP 97900996 A

Priority

  • DE 19600857 A
  • EP 9700097 W

Abstract (en)

[origin: DE19600857A1] A process is disclosed for maintaining a constant concentration of substances in an electroplating bath, preferably a bath with aqueous solutions. According to known processes, substance concentrates are added to the bath to compensate for the continuous consumption of chemicals. This has the disadvantage of rapidly increasing the concentration of disturbing substances in the process solution. In order to reduce this concentration, another dosing method is known, namely the continuous exchange of bath solution by means of an overflow. The admixture of bath solution with the bath concentration is compensated by the overflow. However, this process does not allow the working concentration of chemically critical baths to be maintained on the long term either, because of evaporation and entrainment. This problem is solved by the invention by continuously or intermittently withdrawing a defined amount of bath solution and adding a preferably equal amount of fresh bath solution. The changes in substance concentration in the bath caused by evaporation and entrainment are compensated in a totally dosing-independent manner.

IPC 1-7 (main, further and additional classification)

C25D 21/14

IPC 8 full level (invention and additional information)

C25D 21/14 (2006.01)

CPC (invention and additional information)

C25D 21/14 (2013.01)

Designated contracting state (EPC)

AT DE ES FR GB IT NL SE

EPO simple patent family

DE 19600857 A1 19970717; AT 191243 T 20000415; EP 0873435 A1 19981028; EP 0873435 B1 20000329; ES 2144840 T3 20000616; HK 1015421 A1 20001027; JP 2000503071 A 20000314; US 6083374 A 20000704; WO 9725456 A1 19970717

INPADOC legal status


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2001-03-14 [26N] NO OPPOSITION FILED

2000-07-28 [ET] FR: TRANSLATION FILED

2000-07-26 [GBT] GB: TRANSLATION OF EP PATENT FILED (GB SECTION 77(6)(A)/1977)

- Effective date: 20000629

2000-06-16 [REG ES FG2A] DEFINITIVE PROTECTION

- Document: ES 2144840 T3

2000-05-30 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: ING. ZINI MARANESI & C. S.R.L.

2000-05-04 [REF] CORRESPONDS TO:

- Document: DE 59701358 20000504

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- Document: AT 191243 T 20000415

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- Owner name: ATOTECH DEUTSCHLAND GMBH

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