Patent US3639565A successfully refreshed from Google Patents.
US3639565A
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US
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Gastric-resistant tablets coated with erythrosine and hydroxypropylethylcellulose
Assignee: Abbott Laboratories
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Filing: 1970-04-15
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Granted: 1972-02-01
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Expires: 1990-04-15
Abstract
Abstract A COMPOSITION CONSISTING ESSENTIALLY OF HYDROXYPROPYLMETHYLCELLULOSE AND ERYTHROSINE HAS BEEN FOUND TO BE SUBSTANTIALLY INSOLUBLE IN GASTRIC JUICES BUT READILY SOLUBLE IN INTESTINAL JUICES. IT THEREFORE PROVIDES AN EXCELLENT COATING COMPOSITION FOR TABLETS, GRANULES AND POWDERS INTENDED FOR DISSOLUTION IN THE INTESTINES AND FOR TABLETS, GRANULES AND POWDERS CONTAINING A DRUG SENSITIVE TO THE ACIDIC ENVIRONMENT OF THE STOMACH.
Inventors
- 👤 Elliott Prillig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:36
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284; A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/282; A61K9/2833; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |