US3577514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained release pharmaceutical tablets
Assignee: Pfizer Inc
•
Filing: 1968-06-10
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Granted: 1971-05-04
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Expires: 1988-06-10
Abstract
Abstract A SUSTAINED RELEASE PHARMACEUTICAL TABLET CHARACTERIZED BY A SUBSTANTIALLY CONSTANT RATE OF DRUG RELEASE COMPRISING; (A) MEDICAMENT; (B) A HYDROPHOBIC DISSOLUTION RETARDANT; (C) AN ACID-INSOLUBLE RELEASE AGENT; AND (B) A WATER-SOLUBLE OR DISPERSIBLE BINDER.
Inventors
- 👤 Ira C Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |