Pellet for administration to ruminants
US4863455A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Apr 17, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M31/002
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A pellet for administration to ruminants to supply magnesium and other biologically active material, for example, anthelmintics or antibiotics comprises a tube of magnesium alloy 1 enclosing a core or filling 3. The core 3 typically comprises mainly iron shot as weighting material, a biologically active material if desired and an electrically conductive material such as carbon or graphite. The graphite ensures that the core 3 as a whole is conductive and provides a cathode electrically coupled with the magnesium alloy tube 1 to form a galvanic cell. Liquor in the rumen serves as an electrolyte to cause galvanic corrosion of the magnesium tube 1 to release the active material contained in the core 3. A protective coating 5 of resin is provided on the tube's exterior surface except on at least one end 4 so that the corrosion is limited to the exposed surfaces only. An alternative embodiment (FIG. 4) comprises a control magnesium alloy rod or shaft 11 around which a cylinder 13 of the electrically conductive component is pressed. The cylinder contain iron shot and graphite in similar proportions to the core 3 in the first embodiment and is also provided with a protective resin coating…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.