US2951792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained release pharmaceutical tablets
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1959-11-18
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Granted: 1960-09-06
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Expires: 1979-11-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph V Swintosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:38
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2072; A61K9/2086; A61K9/209
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A SUBSTANTIALLY FLAT FACED SUSTAINED RELEASE PHARMACEUTICAL TABLET HAVING AN IMMEDIATE RELEASE LAYER CONTAINING A MEDICAMENT DISPERSED IN A FILLER, SAID IMMEDIATE RELEASE LAYER PROVIDING A THERAPEUTIC BLOOD LEVEL OF SAID MEDICAMENT, A SUSTAINED RELEASE LAYER CONTIGUOUS WITH SAID FIRST MENTIONED LAYER AND CONTAINING AND SAME MEDICAMENT DISPERSED WITHIN GRANULES OF A SOLID INGESTIBLE LIPID TIME DELAY MATERIAL SELECTED FROM THE GROUP CONSISTING OF FATTY ALCOHOLS HAVING FROM 12 TO 31 CARBON ATOMS, GLYCERYL ESTERS FORMED FROM FATTY ACIDS HAVING FROM 10 TO 22 CARBON ATOMS AND ESTERS HAVING FROM 24 TO 62 CARBON ATOMS FORMED FROM FATTY ACIDS HAVING FROM 12 TO 31 CARBON ATOMS AND FATTY ALCOHOLS HAVING FROM 12 TO 31 CARBON ATOMS, THE TOTAL SURFACE AREA OF SAID SUSTAINED RELEASE LAYER INCLUDING THE FACE ABUTTING THE IMMEDIATE RELEASE LAYER BEING IN THE RANGE OF FROM 2.5 TO 25 TIMES THE SIDE SURFACE AREA OF SAID SUSTAINED RELEASE LAYER, SAID SUSTAINED RELEASE LAYER PROVIDING A SUBSTANTIALLY UNIFORM RELEASE FOR A PERIOD OF IN EXCESS OF FOUR HOURS, SAID IMMEDIATE RELEASE LAYER BEING EXTERIOR OF SAID SUSTAINED RELEASE LAYER.
Claim 2
Dependent Claim
181 words
A SUBSTANTIALLY FLAT FACED SUSTAINED RELEASE PHARMACEUTICAL TABLET HAVING AN IMMEDIATE RELEASE LAYER CONTAINING A MEDICAMENT DISPERSED IN A FILLER, SAID IMMEDIATE RELEASE LAYER PROVIDING A THERAPEUTIC BLOOD LEVEL OF SAID MEDICAMENT, A SUSTAINED RELEASE LAYER CONTIGUOUS WITH SAID FIRST MENTIONED LAYER AND CONTAINING AND SAME MEDICAMENT DISPERSED WITHIN GRANULES OF A SOLID INGESTIBLE LIPID TIME DELAY MATERIAL SELECTED FROM THE GROUP CONSISTING OF FATTY ALCOHOLS HAVING FROM 12 TO 31 CARBON ATOMS, GLYCERYL ESTERS FORMED FROM FATTY ACIDS HAVING FROM 10 TO 22 CARBON ATOMS AND ESTERS HAVING FROM 24 TO 62 CARBON ATOMS FORMED FROM FATTY ACIDS HAVING FROM 12 TO 31 CARBON ATOMS AND FATTY ALCOHOLS HAVING FROM 12 TO 31 CARBON ATOMS, THE TOTAL SURFACE AREA OF SAID SUSTAINED RELEASE LAYER INCLUDING THE FACE ABUTTING THE IMMEDIATE RELEASE LAYER BEING IN THE RANGE OF FROM 2.5 TO 25 TIMES THE SIDE SURFACE AREA OF SAID SUSTAINED RELEASE LAYER, SAID SUSTAINED RELEASE LAYER PROVIDING A SUBSTANTIALLY UNIFORM RELEASE FOR A PERIOD OF IN EXCESS OF FOUR HOURS, SAID IMMEDIATE RELEASE LAYER BEING EXTERIOR OF SAID SUSTAINED RELEASE LAYER.
References Cited (Backward Citations)
US701438A
Cited
US2793979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |