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US 4,564,363 AGranted
Delayed action assembly
AssigneeSmithKline Beckman Corporation
InventorsBrian G. Bagnall, Robert J. Gyurik
Life of this patent
Estimating the term…
Abstract
A device for effecting the delayed release of an active ingredient comprises a container and, within, a dispersible unit of ingredient, a removable closure and a electrical control circuit for removal of said closure at a designated time to release the active ingredient. Several assemblies are combined to control the administration of veterinary medicaments to ruminant animals as a specific application of the invention.
Claims8
A delayed release, ruminant dosage form comprising from 1 to 4 dosage unit release assemblies, at least one of which is a delayed action assembly which, in turn, comprises;
- a closed, non-biodegradable outer wall;
- a dosage unit of an active ingredient in dispersible form within said wall;
- a water-tight cover or plug which is capable of being displaced by internal gas pressure and which extends through said outer wall;
- weight means sufficient to retain said delayed action assembly in the rumen and arranged within said dosage form, and
- an internally disposed electrical circuit means which, in turn, comprises, interconnected;
- a source of current;
- an internally disposed chemical squib for generating internal gas pressure, within the assembly,
- sufficient to remove said removable cover or plug;
- means for timing and activating said chemical squib, and
- means for activating said circuit.
7 more elements
Dependencies are inferred from the claim text.