US4713237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained release dosage form
Assignee: Merck Sharp & Dohme LLC
•
Filing: 1984-06-18
•
Granted: 1987-12-15
•
Expires: 2004-06-18
Abstract
Abstract Sustained release dosage forms are made of saponified starch-acrylonitrile graft copolymers and an active ingredient.
Inventors
- 👤 Mahendra Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:57
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2059; A61K47/00; A61K47/30; A61K47/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A sustained release dosage form comprising an effective amount of active ingredient and an effective amount of a water insoluble, water swellable, saponified starch acrylonitrile graft copolymer to provide sustained release of said active upon oral administration to a patient in need of such treatment.
Claim 2
Dependent Claim
45 words
A sustained release dosage form comprising an effective amount of active ingredient and an effective amount of a water insoluble, water swellable, saponified starch acrylonitrile graft copolymer to provide sustained release of said active upon oral administration to a patient in need of such treatment.
Claim 3
Dependent Claim
20 words
A sustained release dosage form according to claim 1 wherein the dosage form further comprises a capsule for oral administration.
Claim 4
Dependent Claim
20 words
A sustained release dosage form according to claim 1 wherein the dosage form further comprises a tablet for oral administration.
References Cited (Backward Citations)
US3495000A
Cited
US3577512A
Cited
US3661815A
Cited
US3909444A
Cited
US3919436A
Cited
US4265875A
Cited
US4116899A
Cited
US4159260A
Cited
US4304591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |