Sustained-release formulation and production thereof
US4828840A · kind A · utility
57Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Jun 26, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/5078
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Sustained-release formulations which can release a water-soluble active ingredient or ingredients at the zero-order over a long period of time, comprising: PA1 a. an inert core, PA1 b. a powder-coating layer containing a water-soluble active ingredient or ingredients, PA1 c. a powder-coating layer of practically water-repellent material, and PA1 d. a film-coating layer composed of practically pH-independent and water-insoluble film-coating material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.