Patent · US Expired

Method of bleaching

US5188814A · kind A · utility

3Cited by

5References

12Claims

0Family size

Assignees

Eka Nobel AB · SE
Faxe Kalk

Inventors

Pia Hellström · Honeytree Loop East, SE
Ivan Dalin · Kungälv, SE
Steen Linderstrom-Lang · Avenue Madeleine, DK

Key dates

Filing date	Oct 28, 1991
Grant date	Feb 23, 1993
Priority date	—
Expiry date	Oct 28, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/80
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention concerns a method of bleaching particles containing calcium carbonate by keeping them in contact with an aqueous solution containing hydrogen peroxide and having a pH-value below 8.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.