US4654206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast release solid preparation of dihydropyridine a compound
Assignee: Astellas Pharma Inc
•
Filing: 1984-07-26
•
Granted: 1987-03-31
•
Expires: 2004-07-26
Abstract
Abstract This invention relates to a fast release solid preparation, which comprises a solid dispersion composition containing dihydropyridien A compound uniformly dispersed in hydroxypropylmethyl cellulose as the dispersion medium, said dihydropyridine A compound being maintained in the amorphous state in said solid dispersion composition.
Inventors
- 👤 Kiyoshi Okuda
- 👤 Renji Aoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:53
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; A61K9/14; A61K9/141; A61K9/146
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A fast release solid preparation, which comprises a solid dispersion composition containing dihydropyridine A compound uniformly dispersed in hydroxypropylmethyl cellulose as the dispersion medium, said dihydropyridine A compound being maintained in the amorphous state in said solid dispersion composition.
Claim 2
Dependent Claim
39 words
A fast release solid preparation, which comprises a solid dispersion composition containing dihydropyridine A compound uniformly dispersed in hydroxypropylmethyl cellulose as the dispersion medium, said dihydropyridine A compound being maintained in the amorphous state in said solid dispersion composition.
Claim 3
Dependent Claim
15 words
The fast release solid preparation of claim 1, wherein the dosage form is a tablet.
Claim 4
Dependent Claim
10 words
The tablet of claim 2, wherein its surface is film-coated.
Claim 5
Dependent Claim
25 words
The fast release solid preparation of claim 1, wherein dihydropyridine A compound and hydroxypropylmethyl cellulose are in the ratio of 1:3 to 1:7 by weight.
References Cited (Backward Citations)
US3852421A
Cited
US4265875A
Cited
US4412986A
Cited
GB2050828A
Cited
GB2122085A
Cited
GB2053681A
Cited
US4259314A
Cited
JPS5877811A
Cited
GB2111386A
Cited
US4369172A
Cited
JPS58109412A
Cited
US4389393A
Cited
US4389393B1
Cited
DE3307422A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |