Two step method for preparation of controlled release formulations
US5145675A · kind A · utility
90Cited by
29References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Jan 23, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/56
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Active substances intended for topical application are incorporated in novel formulations in which they are retained as impregnants inside the pores of porous solid particles or microspheres. The pores form a continuous network open to the exterior of the particles, permitting outward diffusion of the impregnants at a controlled rate depending on the pore size. The impregnated particles are prepared by impregnation of preformed particles with the active substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.