Dyes incorporating annionic and cationic groups
US7066969B2 · kind B2 · utility
1Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2002 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Dec 23, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/919
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel compounds of the formulae A, D1, D2, R1 and n are as defined in the description the compounds being in an internal or external salt form, or mixtures of compounds (1) and (2), a process for their preparation and preparations containing them used for dyeing paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.