US2897122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enteric coated product
Assignee: Merck Frosst Canada and Co
•
Filing: 1957-09-30
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Granted: 1959-07-28
•
Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 John F Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:39
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A SOLID MEDICINAL ORAL DOSAGE UNIT CONTAINING AT LEAST ONE MEDICINAL AGENT, COMPRISING A SHAPED CORE CONTAINING A MEDICINAL AGENT SURROUNDED BY AN ENTERIC FILM OR LAYER OF A PARTIALLY ESTERIFIED POLYVINYL ALCOHOL IN WHICH THE HYDROXYL GROUPS OF THE VINYL GROUPS ARE PARTLY ESTERIFIED BY PHTHALIC ACID, PARTLY ACETYLATED, AND PARTLY UNREPALCED, SAID PARTIALLY ESTERIFIED POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION OF FROM 600 TO 800, A PHTHALYL CONTENT WITHIN THE RANGE OF FROM 60 TO 70%, AN ACETYL CONTENT OF FROM 1.6 TO 6.0%, SAID ENTERIC COATING BEING SUBSTANTIALLY INSOLUBLE IN THE STOMACH JUICES, SUBSTANTIALLY SOLUBLE IN THE INTESTINAL FLUIDS AND SOLUBLE IN 90-95% ETHYL ALCOHOL.
Claim 2
Dependent Claim
109 words
A SOLID MEDICINAL ORAL DOSAGE UNIT CONTAINING AT LEAST ONE MEDICINAL AGENT, COMPRISING A SHAPED CORE CONTAINING A MEDICINAL AGENT SURROUNDED BY AN ENTERIC FILM OR LAYER OF A PARTIALLY ESTERIFIED POLYVINYL ALCOHOL IN WHICH THE HYDROXYL GROUPS OF THE VINYL GROUPS ARE PARTLY ESTERIFIED BY PHTHALIC ACID, PARTLY ACETYLATED, AND PARTLY UNREPALCED, SAID PARTIALLY ESTERIFIED POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION OF FROM 600 TO 800, A PHTHALYL CONTENT WITHIN THE RANGE OF FROM 60 TO 70%, AN ACETYL CONTENT OF FROM 1.6 TO 6.0%, SAID ENTERIC COATING BEING SUBSTANTIALLY INSOLUBLE IN THE STOMACH JUICES, SUBSTANTIALLY SOLUBLE IN THE INTESTINAL FLUIDS AND SOLUBLE IN 90-95% ETHYL ALCOHOL.
References Cited (Backward Citations)
US2455790A
Cited
GB724544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |