Patent US2348772A successfully refreshed from Google Patents.
Patent US3789117A successfully refreshed from Google Patents.
US3789117A
Expired / Lapsed
US
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Process for the preparation of enteric medicaments
Assignee: Freund Corp
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Filing: 1971-07-19
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Granted: 1974-01-29
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Expires: 1991-07-19
Abstract
Abstract An improved enteric coating for medicament less soluble in gastric juice or water is obtained by coating a medicament with an organic solvent-soluble cellulose derivative in which the hydrogen atom of one hydroxyl group has been substituted by a carboxymethyl group and at least one of other hydroxyl groups have been esterified or etherified.
Inventors
- 👤 Ind Co Ltd Freund
- 👤 T Tsujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:47
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
The process of claim 1, wherein said cellulose derivative is a member selected from the group consisting of carboxymethyl, cellulose acetate, carboxymethyl hydroxypropyl cellulose acetate, carboxymethyl ethyl cellulose, and carboxymethyl cellulose stearic acid ester derivatives.
Claim 2
Dependent Claim
32 words
The process of claim 1, wherein said organic solvent is a member selected from the group consisting of methanol, ethanol, isopropanol, ethyl acetate, benzene, toluene, dioxane, acetone, methylene chloride, trichloroethylene, and chloroform.
Claim 3
Dependent Claim
14 words
The process of claim 1, wherein said medicament to be coated is an enzyme.
Claim 4
Dependent Claim
40 words
The process of claim 1, wherein the ester so formed is a member selected from the group consisting of an acetic acid ester group, a propionic acid ester group, a butyric acid ester group, and a higher fatty acid group.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein a nitric acid ester group replaces said carboxy acid ester group.
Claim 6
Dependent Claim
10 words
An enteric coated medicament prepared by the process of claim
References Cited (Backward Citations)
US3629237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |