Patent US3835221A successfully refreshed from Google Patents.
US3835221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orally administrable drug dosage form having delayed action
Assignee: Hoechst AG
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Filing: 1971-03-04
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Granted: 1974-09-10
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Expires: 1991-03-04
Abstract
Abstract Process for the manufacture of an orally administrable, delayedaction drug dosage form having the form of small globules which are provided with a release-delaying coating, wherein the active substance is applied onto small inert, essentially round globules, the globules so coated are provided with a releasedelaying coating which is suitable as dialysis membrane and which contains as film former polyvinyl acetate, preferably in admixture with ethyl cellulose, and filling the globules so obtained in dosage units.
Inventors
- 👤 W Fulberth
- 👤 E Neitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:33
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5073; A61K9/5078
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
A dosage unit from as in claim 1 wherein said polyvinyl acetate has a K-value between 20 and 40.
Claim 2
Dependent Claim
20 words
A dosage unit form as in claim 1 wherein said ethyl cellulose has an ethoxyl content between 45 and 46.5.
Claim 3
Dependent Claim
20 words
A dosage unit form as in claim 1 wherein said ethyl cellulose has an ethoxy content between 48 and 49.5.
Claim 4
Dependent Claim
18 words
A dosage unit form as in claim 3 wherein said ethyl cellulose has a viscosity of 50 centipoises.
Claim 5
Dependent Claim
26 words
A dosage unit form as in claim 1 wherein said polymer coating consists essentially of polyvinyl acetate and ethyl cellulose in a weight proportion of 3:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |