Pharmaceutical tablets releasing the active substance after a definite period of time
US5464633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1994 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | May 24, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/2866
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Pharmaceutical tablets releasing the active substance after a definite period of time, consisting of: a core containing the active substance and polymeric substances which swell and/or gel and/or erode on contact with water or with aqueous liquids; a layer applied externally to said core, suitable to prevent the immediate release of the active substance contained in the core and to allow the release of said active substance after a definite period of time, consisting of natural and/or synthetic polymeric materials of the class of the hydrophilic polymers which erode and/or gel and/or dissolve in an aqueous medium; a possible gastroresistant and enterosoluble coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.