Controlled release device for an active substance
US4803076A · kind A · utility
167Cited by
10References
39Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1986 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Sep 4, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A device for the controlled release of a substance having useful activity into a fluid medium at a substantially constant rate, said substance contained in a shape which is substantially that of a truncated cone by means of an impermeable wall or coating on the base and side (but not the top) of said truncated cone. Apparatus useful in manufacture when said device is a tablet for administration to a mammal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.