Patent US4871544A successfully refreshed from Google Patents.
US4871544A
Expired / Lapsed
US
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Ruminant dispensing device
Assignee: Alza Corp
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Filing: 1987-11-27
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Granted: 1989-10-03
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Expires: 2007-11-27
Abstract
Abstract A dispensing device is disclosed for delivering a beneficial agent. The device comprises (1) a housing defining an internal space, (2) an expandable composition comprising a dense member in the space, (3) a composition comprising a beneficial agent and a non-toxic heat responsive carrier in the space, and (4) a passageway in the housing for delivering the beneficial agent from the dispensing device.
Inventors
- 👤 James B. Eckenhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:17
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0004; A61M; A61M31/00; A61M31/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A laminated arrangement use for manufacturing a delivery system for delivering a beneficial agent to an animal, wherein the laminated arrangement comprises a first lamina consisting essentially of (1) a hydrogel that absorbs an aqueous fluid and exhibits a 2 to 50 fold increase in size, said hydrogel consisting essentially of (2) a dense material selected from the group consisting of iron, steel, iron magnesium alloy, mixture of cobalt and iron, copper oxide, iron oxide and a mixture of copper oxide and iron.
Claim 2
Dependent Claim
83 words
A laminated arrangement use for manufacturing a delivery system for delivering a beneficial agent to an animal, wherein the laminated arrangement comprises a first lamina consisting essentially of (1) a hydrogel that absorbs an aqueous fluid and exhibits a 2 to 50 fold increase in size, said hydrogel consisting essentially of (2) a dense material selected from the group consisting of iron, steel, iron magnesium alloy, mixture of cobalt and iron, copper oxide, iron oxide and a mixture of copper oxide and iron.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |