Process for isolating easily soluble basic oxazine dyestuffs and phenazine dyestuffs
US3972879A · kind A · utility
3Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Oct 17, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B19/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Basic oxazine and phenazine dyestuffs are isolated from their solutions by adding urea or thiourea.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.