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US3018221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Penicillin-sulfonamide tablet
Assignee: Merck Frosst Canada and Co
•
Filing: 1958-03-28
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Granted: 1962-01-23
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Expires: 1978-03-28
Abstract
No abstract record available.
Inventors
- 👤 John F Millar
- 👤 Lindner Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:50
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; A61K31/425; A61K31/429; A61K31/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PENICILLIN-SULFONAMIDE TABLET CONSISTING OF A CORE TABLET CONSISTING OF COMPRESSED GRANULES OF PENICILLIN, AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE SULFONAMIDE DRUG AND AMMONIATED POLYVINYL ACETATE PHTHALATE, AND A COMPRESSED CONCENTRIC SHELL CONSISTING ESSENTIALLY OF A GRANULAR MIXTURE OF PENICILLIN AND AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE SULFONAMIDE DRUG.
Claim 2
Dependent Claim
47 words
A PENICILLIN-SULFONAMIDE TABLET CONSISTING OF A CORE TABLET CONSISTING OF COMPRESSED GRANULES OF PENICILLIN, AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE SULFONAMIDE DRUG AND AMMONIATED POLYVINYL ACETATE PHTHALATE, AND A COMPRESSED CONCENTRIC SHELL CONSISTING ESSENTIALLY OF A GRANULAR MIXTURE OF PENICILLIN AND AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE SULFONAMIDE DRUG.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |