Global Patent Index - EP 0981598 A1

EP 0981598 A1 2000-03-01 - PROCESS FOR REMOVING TARNISH FROM TARNISHED SILVERWARE

Title (en)

PROCESS FOR REMOVING TARNISH FROM TARNISHED SILVERWARE

Title (de)

VERFAHREN ZUM ENTFERNEN DES BESCHLAGS VON ANGELAUFENEM SILBER

Title (fr)

PROCEDE ANTI-TERNISSANT POUR L'ARGENTERIE TERNIE

Publication

EP 0981598 A1 (EN)

Application

EP 98921088 A

Priority

  • GB 9709575 A
  • US 9809520 W

Abstract (en)

[origin: GB2325243A] A process for removing tarnish from tarnished silverware comprising contacting the tarnish silverware with an anti-tarnish composition in an automatic dishwasher. The anti-tarnish composition comprises an alkaline electrolyte and a metal additive which has a more negative standard redox potential than silver, measured relative to a standard hydrogen electrode at 25‹C. The metal additive may be aluminium, manganese, magnesium, iron or zinc; and the alkaline electrolyte may be an alkali metal or alkaline earth metal hydroxide, carbonate or bicarbonate, eg sodium hydroxide. In addition builder compounds and nonionic surfactants may be present.

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

C11D 3/12; C11D 3/02

IPC 8 full level (invention and additional information)

C11D 3/00 (2006.01); C11D 3/02 (2006.01); C11D 3/12 (2006.01); C23G 1/20 (2006.01)

CPC (invention and additional information)

C11D 3/046 (2013.01); C11D 3/0073 (2013.01); C11D 3/1206 (2013.01); C23G 1/20 (2013.01)

Citation (search report)

See references of WO 9851769A1

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

EPO simple patent family

GB 2325243 A 19981118; GB 9709575 D0 19970702; EP 0981598 A1 20000301; WO 9851769 A1 19981119

INPADOC legal status


2002-03-27 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010913

2001-06-13 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010502

2000-03-01 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991206

2000-03-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE