Coal tar extract with reduced aromatic hydrocarbon content, method for obtaining same and dermatological and cosmetic compositions
US6319392A · kind A · utility
6Cited by
6References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1999 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/006
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention concerns a coal tar extract with reduced polycyclic aromatic hydrocarbon and benzo(a)pyrene content and a method for obtaining same using two sequentially linked distillation systems. The invention also concerns cosmetic and dermatological preparations containing said resulting coal tar extract.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.