US3984494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft copolymers of vinyl acetate on polyethylene oxide as self-supporting capsules
Assignee: Hoechst AG
•
Filing: 1974-12-19
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Granted: 1976-10-05
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Expires: 1994-12-19
Abstract
Abstract An encapsulating material for drugs consisting of a modified polyvinyl alcohol which is a partially hydrolized graft copolymer of vinyl acetate on polyethylene oxide.
Inventors
- 👤 Albrecht Harreus
- 👤 Wolfgang Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:30
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/48; A61K9/4816
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
Self-supporting packs or capsules for drugs, wherein the capsule material is composed of a modified polyvinyl alcohol being a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which contains from 1 to 50 weight % of ethylene oxide units, from 1 to 50 weight % of vinyl acetate units, and from 20 to 98 weight % of vinyl alcohol units.
Claim 2
Dependent Claim
62 words
Self-supporting packs or capsules for drugs, wherein the capsule material is composed of a modified polyvinyl alcohol being a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which contains from 1 to 50 weight % of ethylene oxide units, from 1 to 50 weight % of vinyl acetate units, and from 20 to 98 weight % of vinyl alcohol units.
Claim 3
Dependent Claim
49 words
Self-supporting packs or capsules for drugs as claimed in claim 1 wherein the capsule material is composed of from 20 to 30 weight % of ethylene oxide units, from 20 to 30 weight % of vinyl acetate units, and from 40 to 60 weight % of vinyl alcohol units.
Claim 4
Dependent Claim
26 words
Self-supporting packs or capsules as claimed in claim 1 wherein the polyethylene oxide component of the graft copolymer has a molecular weight of at least 10,000.
Claim 5
Dependent Claim
27 words
Self-supporting packs or capsules as claimed in claim 2 wherein the polyethylene oxide component of the graft copolymer has a molecular weight of about 20,000 to 25,000.
Claim 6
Dependent Claim
64 words
A modified polyvinyl alcohol drug capsule comprising a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which graft copolymer contains: 1 to 50 weight percent ethylene oxide units, 1 to 50 weight percent vinyl acetate units, and 20 to 98 weight percent vinyl alcohol units, wherein the polyethylene oxide component of the graft copolymer has a molecular weight of at least 10,000.
Claim 7
Dependent Claim
64 words
A modified polyvinyl alcohol drug capsule comprising a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which graft copolymer contains: 1 to 50 weight percent ethylene oxide units, 1 to 50 weight percent vinyl acetate units, and 20 to 98 weight percent vinyl alcohol units, wherein the polyethylene oxide component of the graft copolymer has a molecular weight of at least 10,000.
Claim 8
Dependent Claim
69 words
A modified polyvinyl alcohol drug capsule consisting essentially of a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which copolymer contains: 20 to 30 weight percent of ethylene oxide units, 20 to 30 weight percent of vinyl acetate units, and 40 to 60 weight percent of vinyl alcohol units, wherein the polyethylene oxide component of the graft copolymer has a molecular weight of about 20,000 to 25,000.
Claim 9
Dependent Claim
69 words
A modified polyvinyl alcohol drug capsule consisting essentially of a partially saponified graft copolymer of vinyl acetate on polyethylene oxide which copolymer contains: 20 to 30 weight percent of ethylene oxide units, 20 to 30 weight percent of vinyl acetate units, and 40 to 60 weight percent of vinyl alcohol units, wherein the polyethylene oxide component of the graft copolymer has a molecular weight of about 20,000 to 25,000.
Claim 10
Dependent Claim
35 words
The modified polyvinyl alcohol drug capsule of claim 5 which contains about 25 weight percent of ethylene units, about 25 weight percent of vinyl acetate units, and about 50 weight percent of vinyl alcohol units.
Claim 11
Dependent Claim
15 words
The modified polyvinyl alcohol drug capsule of claim 5 wherein the capsule is water soluble.
References Cited (Backward Citations)
US3033841A
Cited
US3218281A
Cited
US3244772A
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US3630955A
Cited
US3726803A
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US3676529A
Cited
US3674704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |