US4265847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tabletting process
Assignee: Schering-Plough Ltd
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Filing: 1980-02-20
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Granted: 1981-05-05
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Expires: 2000-02-20
Abstract
Abstract A direct compression process for forming an effervescent tablet containing an active chemical compound is enhanced by the addition to the composition to be compressed of an alkali metal carbonate.
Inventors
- 👤 Peter Hunt
- 👤 Aston M. Trelford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:07
CPC Classifications
A; A61; A61J; A61J3/00; A61J3/10; A61K; A61K9/00; A61K9/0002; A61K9/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A process for the tabletting direct from powder form without intervening granulation of a composition containing an active compound having sterilizing, bactericidal or pharmaceutical properties, said tablet producing an effervescent action when contacted with water, the process consisting of direct compression in the absence of substantial wetting of a homogenous powdered admixture consisting essentially of said active compound, an alkali metal bicarbonate for carbon dioxide liberation to generate effervescent action, and a solid, water soluble, aliphatic carboxylic acid or acid salt thereof in the presence of an alkali metal carbonate also in powder form, but not primarily for effervescent action to form a stable, soluble and hard tablet composition.
Claim 2
Dependent Claim
109 words
A process for the tabletting direct from powder form without intervening granulation of a composition containing an active compound having sterilizing, bactericidal or pharmaceutical properties, said tablet producing an effervescent action when contacted with water, the process consisting of direct compression in the absence of substantial wetting of a homogenous powdered admixture consisting essentially of said active compound, an alkali metal bicarbonate for carbon dioxide liberation to generate effervescent action, and a solid, water soluble, aliphatic carboxylic acid or acid salt thereof in the presence of an alkali metal carbonate also in powder form, but not primarily for effervescent action to form a stable, soluble and hard tablet composition.
References Cited (Backward Citations)
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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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |