Active agent dispenser
US4564364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1983 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | May 26, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/0296
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The release pattern of a dispersion type active agent dispenser can be improved by forming the device from a depleted zone containing the agent at a concentration no greater than the saturation and a non-depleted zone containing the agent dispersed in the matrix at a uniform concentration greater than saturation. The depleted zone is disposed between the surface through which the agent is to be dispensed and at least a substantial portion of the non-depleted zone with the interface therebetween disposed at a non-uniform distance from the releasing surface. Certain embodiments are particularly useful for the transdermal administration of drugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.