Conversion of liquid filled gelatin capsules into controlled release systems by multiple coatings
US6929803B2 · kind B2 · utility
110Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Apr 16, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/0004
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A dosage form comprising a gelatin capsule formed with a composite wall and containing a liquid, active agent formulation where the wall comprises a barrier layer formed over the external surface of the gelatin capsule, an expandable layer formed over the barrier layer and a semipermeable layer formed over the expandable layer is described. The dosage forms and methods provide for the conversion of standard gelatin, liquid formulation capsules into controlled, release dosage forms that permit the controlled release of the active agent into the environment of use over time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.