Delivery system
US4220152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1979 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Feb 22, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/0068
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Delivery systems and devices for the controlled release of chemicals, including drugs, comprising a wall, formed in part at least, of a porous material, pores of which contain a hydrogel, said porous wall in contact with at least a portion of a reservoir comprised of a chemical and, if desired, a water-soluble liquid excipient and/or a detergent; process for preparation thereof, and use for the controlled release of chemicals, including drugs, to an aqueous liquid-containing environment. Emphasis is given to said systems and devices in which the porous material is a sintered plastic and gelled cellulose triacetate is the hydrogel, and to their use for controlled release of drugs to animals, especially to ruminants over prolonged periods of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.