US3972999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Griseofulvin dosage forms
Assignee: Wyeth LLC
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Filing: 1975-06-25
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Granted: 1976-08-03
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Expires: 1995-06-25
Abstract
Abstract Completely miscible melt mixes of amorphous griseofulvin and certain polyglycolides or lactic acid modified polyglycolides are described which are formed by melting together griseofulvin and the polyglycolide or lactic acid modified polyglycolide, the latter having a molecular weight less than 2000 and a glycolic acid content of about 60 to 100 mole per cent. The cooled melt is transparent, glassy and capable of being finely divided. The griseofulvin contained therein, between 30 and 60% by weight, is amorphous and the finely divided melt mixture can be subdivided and incorporated into dosage forms.
Inventors
- 👤 Andrew G. Tsuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; A; A61; A61K; A61K31/00; A61K31/33; A61K31/335; A61K31/34; A61K9/00; A61K9/14; A61K9/141; A61K9/146; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; A61K9/48; A61K9/4841; A61K9/4866
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A solid glassy miscible melt mix comprising about 30 to 60% by weight of the mix of amorphous griseofulvin and a polyglycolide or lactic acid modified polyglycolide, the polyglycolide having a molecular weight of about 800 to about 2000 and a glycolic acid content of about 60 to 100 mole per cent.
Claim 2
Dependent Claim
52 words
A solid glassy miscible melt mix comprising about 30 to 60% by weight of the mix of amorphous griseofulvin and a polyglycolide or lactic acid modified polyglycolide, the polyglycolide having a molecular weight of about 800 to about 2000 and a glycolic acid content of about 60 to 100 mole per cent.
Claim 3
Dependent Claim
34 words
The solid glassy melt mix of claim 1 wherein the polyglycolide has a molecular weight of about 800 to about 1500 and a glycolic acid content of about 80 to 100 mole per cent.
Claim 4
Dependent Claim
15 words
A griseofulvin dosage form comprising an encapsulated finely divided glassy melt mix of claim 2.
Claim 5
Dependent Claim
92 words
A process for preparing a solid glassy melt mix containing amorphous griseofulvin which comprises: a. reacting at a temperature of 180° to 200°C. glycolic acid in the presence of water with about 0 to 40 mole per cent, based on the glycolic acid, of lactic acid until substantially all of the water has been removed to form a polyglycolide, and b. admixing with the polyglycolide crystalline griseofulvin at a temperature of about 230° to 240°C in an amount sufficient to provide about 30 to 60% by weight of the glassy melt mix.
Claim 6
Dependent Claim
92 words
A process for preparing a solid glassy melt mix containing amorphous griseofulvin which comprises: a. reacting at a temperature of 180° to 200°C. glycolic acid in the presence of water with about 0 to 40 mole per cent, based on the glycolic acid, of lactic acid until substantially all of the water has been removed to form a polyglycolide, and b. admixing with the polyglycolide crystalline griseofulvin at a temperature of about 230° to 240°C in an amount sufficient to provide about 30 to 60% by weight of the glassy melt mix.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |