Buoyant controlled release powder formulation
US5169638A · kind A · utility
152Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Oct 23, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P25/18
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A buoyant controlled release pharmaceutical powder formulation is provided which may be filled into capsules and releases a pharmaceutical of a basic character at a controlled rate regardless of the pH of the environment, which formulation includes a basic pharmaceutical, up to about 45% by weight of a pH dependent polymer which is a salt of alginic acid, such as sodium alginate, up to about 35% by weight of a pH-independent hydrocarbon gelling agent having a viscosity of up to about 100,000 centipoises in 2% solution at 20.degree. C. and excipients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.