Controlled release tablet
US4784858A · kind A · utility
81Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1986 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Aug 22, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/2081
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A controlled release tablet comprising PA0 (I) a core, containing as essential components PA1 (a) at least one water-soluble pharmaceutically active substance which is dispersed in a water-insoluble, non-digestible polymeric excipient, and PA1 (b) a water-insoluble polymeric substance, which is swellable under the influence of water, and PA0 (II) a coating essentially of an elastic, water-insoluble and semipermeable diffusion film of a polymer, is presented, which shows a release pattern for the active substance(s) in a programmed rate of approximately zero order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.