Patent US4564363A successfully refreshed from Google Patents.
US4564363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed action assembly
Assignee: SmithKline Beecham Corp
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Filing: 1983-07-13
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Granted: 1986-01-14
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Expires: 2003-07-13
Abstract
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.
Inventors
- 👤 Brian G. Bagnall
- 👤 Robert J. Gyurik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:35
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0053; A61K9/0068; A61D; A61D7/00; A61M; A61M31/00; A61M31/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
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.
Claim 2
Dependent Claim
138 words
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.
Claim 3
Dependent Claim
16 words
The dosage form of claim 1 in which the chemical squib is comprised of barium styphnate.
Claim 4
Dependent Claim
41 words
The dosage form of claim 1 in which the means for activating the electrical circuit is two wires completing the conductivity circuit by means of reumen content, said wires being exposed to said rumen content on the surface of the form.
Claim 5
Dependent Claim
18 words
The dosage form of claim 1 in which the non-biodegradable wall material is a polyethylene of polypropylene polymer.
Claim 6
Dependent Claim
14 words
The dosage form of claim 1 in which the active ingredient is an anthelmintic.
Claim 7
Dependent Claim
13 words
The dosage form of claim 1 in which the active ingredient is albendazole.
Claim 8
Dependent Claim
55 words
The dosage form of claim 1 for release of an active ingredient, in which said electrical circuit means comprising a source of current, which is sufficient to activate and operate said timing means and said chemical squib, as well as a switch means for activating said electrical circuit means are all disposed within said assembly.
Claim 9
Dependent Claim
23 words
The dosage form of claim 1 in which three assemblies are present, each timed to release its active ingredient at a preset period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |