US2540979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric coating
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1948-04-24
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Granted: 1951-02-06
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Expires: 1968-04-24
Abstract
No abstract record available.
Inventors
- 👤 Harold A Clymer
- 👤 Donald R Macdonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:48
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866; A61K9/282; A61K9/2886
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A NEW ARTICLE OF MANUFACTURE COMPRISING A MEDICAMENT, AND A COATING COMPRISING A LAYER OF A CELLULOSE DERIVATIVE CONTAINING FREE CARBOXYL GROUPS SUBSTANTIALLY INSOLUBLE IN THE STOMACH FLUIDS AND SOLUBLE IN THE INTESTINAL FLUIDS, AND A LAYER OF WAX, SAID WAX LAYER BEING CHARACTERIZED BY THE FACT THAT ITS INTEGRITY WILL BE MAINTAINED IN THE STOMACH AND WILL BE LOST IN TE INTESTINES AND BY THE FACT THAT IT IS NOT LESS THAN 1/2% BY WEIGHT OF THE MEDICAMENT.
Claim 2
Dependent Claim
79 words
A NEW ARTICLE OF MANUFACTURE COMPRISING A MEDICAMENT, AND A COATING COMPRISING A LAYER OF A CELLULOSE DERIVATIVE CONTAINING FREE CARBOXYL GROUPS SUBSTANTIALLY INSOLUBLE IN THE STOMACH FLUIDS AND SOLUBLE IN THE INTESTINAL FLUIDS, AND A LAYER OF WAX, SAID WAX LAYER BEING CHARACTERIZED BY THE FACT THAT ITS INTEGRITY WILL BE MAINTAINED IN THE STOMACH AND WILL BE LOST IN TE INTESTINES AND BY THE FACT THAT IT IS NOT LESS THAN 1/2% BY WEIGHT OF THE MEDICAMENT.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |