US5019397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous emulsion for pharmaceutical dosage form
Assignee: Alza Corp
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Filing: 1988-04-21
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Granted: 1991-05-28
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Expires: 2008-04-21
Abstract
Abstract A dosage form is disclosed comprising a cured emulsion that coat that surrounds a drug. The emulsion comprises a lower alkyl acrylate-lower alkyl methacrylate copolymer and ethyl cellulose. The emulsion optionally comprises a hydrophilic polymer.
Inventors
- 👤 Patrick S. L. Wong
- 👤 Felix Theeuwes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:44
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866; A61K9/0002; A61K9/0004; A61K9/284; A61K9/2846
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
An osmotic device comprising: (a) a wall comprising an aqueous emulsion of a lower alkylacrylate-lower methacrylate wherein the lower alkyl comprises 1 to 7 carbon atoms and an aqueous emulsion of ethyl cellulose, said wall formed by calescence at a temperature up to 65° C. for up to 72 hours, which wall surrounds; (b) a compartment; (c) a therapeutically effective amount of drug in the compartment; and, (d) at least one passageway in the wall connecting the exterior with the interior of the device for delivering drug over time.
Claim 2
Dependent Claim
89 words
An osmotic device comprising: (a) a wall comprising an aqueous emulsion of a lower alkylacrylate-lower methacrylate wherein the lower alkyl comprises 1 to 7 carbon atoms and an aqueous emulsion of ethyl cellulose, said wall formed by calescence at a temperature up to 65° C. for up to 72 hours, which wall surrounds; (b) a compartment; (c) a therapeutically effective amount of drug in the compartment; and, (d) at least one passageway in the wall connecting the exterior with the interior of the device for delivering drug over time.
Claim 3
Dependent Claim
14 words
The osmotic device according to claim 1, wherein the emulsion comprises a hydrophilic polymer.
Claim 4
Dependent Claim
12 words
THe osmotic device according to claim 1, wherein the drug is nifedipine.
Claim 5
Dependent Claim
12 words
The osmotic device according to claim 1, wherein the drug is salbutamol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |