Asymmetric microporous beads for controlled release
US5888930A · kind A · utility
59Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Mar 13, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/1652
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A durable and sprayable controlled release bead of active ingredient in the pores of a polymeric micro-porous bead having an anisotropic pore structure of large pores in the interior and small pores at the surface, the gradation of pore sizes between the interior and the surface being continuous.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.