Patent US5395456A successfully refreshed from Google Patents.
US3279998A
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Method of preparing sustained release tablets
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1964-12-30
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Granted: 1966-10-18
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Allan M Raff
- 👤 Edward V Svedres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2013; F; F04; F04C; F04C2210/00; F04C2210/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A METHOD OF PREPARING COMPRESSED SUBSTAINED RELEAST PHARMACEUTICAL TABLES HAVING A MEDICAMENT DISPERSED THROUGHOUT A NON-GRANULATED COMMINUTED MATERIAL WHICH IS RESISTANT TO DISINTEGRATION AND SLOWLY DISPERSIBLE IN THE GASTOINTESTINAL TRACT AND WHICH HAS NOT BEEN PREVIOUSLY SUBJECTED TO COMPRESSION THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF MIXING UNIFORMLY FROM AT LEAST ABOUT 7% TO ABOUT 95% OF A SOLID SUSTAIN RELEASE MATERIAL HAVING A PARTICLE SIZE OF FROM ABOUT 10 MICRONS TO ABOUT 1500 MICRONS AND BEING RESISTANT TO DISINTEGRATION AND ALOWLY DISPERSIBLE IN THE GASTROINTESTINAL TRACT WITH A MEDICAMENT HAVING A PARTICLE SIZE OF FROM BOUT 10 MICRONS TO ABOUT 1500 MICRONS AND THEN COMPRISING SAID MIXTURE INTO A TABLET.
Claim 2
Dependent Claim
111 words
IN A METHOD OF PREPARING COMPRESSED SUBSTAINED RELEAST PHARMACEUTICAL TABLES HAVING A MEDICAMENT DISPERSED THROUGHOUT A NON-GRANULATED COMMINUTED MATERIAL WHICH IS RESISTANT TO DISINTEGRATION AND SLOWLY DISPERSIBLE IN THE GASTOINTESTINAL TRACT AND WHICH HAS NOT BEEN PREVIOUSLY SUBJECTED TO COMPRESSION THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF MIXING UNIFORMLY FROM AT LEAST ABOUT 7% TO ABOUT 95% OF A SOLID SUSTAIN RELEASE MATERIAL HAVING A PARTICLE SIZE OF FROM ABOUT 10 MICRONS TO ABOUT 1500 MICRONS AND BEING RESISTANT TO DISINTEGRATION AND ALOWLY DISPERSIBLE IN THE GASTROINTESTINAL TRACT WITH A MEDICAMENT HAVING A PARTICLE SIZE OF FROM BOUT 10 MICRONS TO ABOUT 1500 MICRONS AND THEN COMPRISING SAID MIXTURE INTO A TABLET.
References Cited (Backward Citations)
US3108046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |