Method for optically brightening paper
US6302999A · kind A · utility
6Cited by
10References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1998 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Sep 14, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/68
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A simplified method for the optical brightening of paper either in the pulp mass, the size or metering press or by coating by the use of a formulation of an optical brightening agent together with a swellable layered silicate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.