US4781919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained release dosage form
Assignee: Merck Sharp & Dohme LLC
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Filing: 1987-11-14
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Granted: 1988-11-01
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Expires: 2007-11-14
Abstract
Abstract Sustained release dosage forms are made of saponified starch-acrylonitrile graft copolymers and an active ingredient.
Inventors
- 👤 Stephen M. Liebowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:20
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/30; A61K47/36; A61K9/00; A61K9/0012; A61K9/0019; A61K9/20; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2059
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A sustained release injectable dosage form comprising an effective amount of an active ingredient, and an effective amount of a water insoluble, water swellable, saponified starch acrylonitrile graft copolymer to provide sustained release of said active ingredient upon injection into a patient in need of such treatment.
Claim 2
Dependent Claim
47 words
A sustained release injectable dosage form comprising an effective amount of an active ingredient, and an effective amount of a water insoluble, water swellable, saponified starch acrylonitrile graft copolymer to provide sustained release of said active ingredient upon injection into a patient in need of such treatment.
Claim 3
Dependent Claim
23 words
A sustained release dosage form as in claim 1 wherein the saponified starch-acrylonitrile graft copolymer is ##STR2## R=CONH 2 or --CO 2 Na.
Claim 4
Dependent Claim
17 words
A sustained release dosage form as defined in claim 1 wherein the dosage form is a suspension.
References Cited (Backward Citations)
US4713237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |