Prolonged release microcapsules and their production
US4711782A · kind A · utility
143Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1986 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Dec 11, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A microcapsule produced by preparing a water-in-oil emulsion comprising an inner aqueous layer containing said water-soluble drug and a drug retaining substance therefor and an oil layer containing a polymer substance, then thickening or solidifying said inner aqueous layer to a viscosity of not lower than about 5000 centiposes and finally subjecting the resulting emulsion to in water drying gives prolonged release of water-soluble drug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.