Method for producing 1-naphthol-4-sulphonic acid
US4540525A · kind A · utility
0Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1984 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Aug 30, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C309/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a method for producing 1-naphthol-4-sulphonic acid in free acid form and contaminated with less than 2% by weight of the isomeric 1-naphthol-2-sulphonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.