Pharmaceutical tablet capable of releasing the active ingredients contained therein at subsequent times
US5650169A · kind A · utility
71Cited by
0References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Oct 24, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/2072
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A pharmaceutical tablet capable of releasing the active ingredients contained therein at subsequent times produced via the steps of: a) preparing a tablet consisting of three superposed layers, the upper layer containing an active ingredient, the intermediate layer not containing any active ingredient and forming a barrier-type layer, and the lower layer containing an active ingredient, said upper layer presenting a raised top, b) coating the tablet entirely with an impermeable polymeric film, and c) removing said raised top and thus allowing contact of the abraded upper layer surface with the environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.