Patent US3634584A successfully refreshed from Google Patents.
US3634584A
Expired / Lapsed
US
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Sustained action dosage form
Assignee: Wyeth LLC
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Filing: 1969-02-13
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Granted: 1972-01-11
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Expires: 1989-02-13
Abstract
Abstract THE INVENTION IS DIRECTED TO A SUSTAINED-RELEASE DOSAGE FORM UTILIZING A CARBOXY VINYL POLYMER AND POLYETHYLENE GLYCOL COMPLEX AS A MEANS OF CONTROLLING THE RATE OF RELEASE OF A DRUG, SUBSTANTIALLY INDEPENDENT OF PH.
Inventors
- 👤 John W Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:17
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2027; A61K9/2031; A61K9/2072; A61K9/2086; A61K9/209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |