Liquid crystal containing cosmetic and pharmaceutical compositions and methods for utilizing such compositions
US4999348A · kind A · utility
19Cited by
42References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1987 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Dec 11, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q19/08
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Cosmetic and pharmaceutical compositions and methods comprising delivery systems for the controlled release and enhanced penetration of biologically active materials (e.g., Vitamin A) to the skin. The delivery systems comprise cholesteric liquid crystals wherein the active material is retained within the lamellar molecular structure (i.e., between the molecular sheets) of the cholesteric liquid crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.