US4752470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release indomethacin
Assignee: NORTEC DEVELOPMENT ASSOCIATES Inc (NORTEC) A CORP OF NEW JERSEY
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Filing: 1986-11-24
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Granted: 1988-06-21
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Expires: 2006-11-24
Abstract
Abstract In accordance with the present invention, the controlled release formulation contains coated pellets of indomethacin of only one type. The pellet releases indomethacin in both immediate and sustained release form. The immediate release indomethacin is rapidly absorbed from the stomach to provide a bolus dose of active agent. The sustained release indomethacin is gradually released over time to maintain the blood levels at effective concentrations for long periods of time.
Inventors
- 👤 Atul M. Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:01
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/40; A61K31/403; A61K31/404; A61K31/405; A61K9/00; A61K9/48; A61K9/50; A61K9/5073; A61K9/5078
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
An indomethacin controlled release formulation consisting essentially of: (a) one type of indomethacin containing pellet one which exhibits both immediate release and sustained release characteristics comprising (1) a non-pareil pellet; (2) a first coating comprised of about 5% to about 30% by weight of said pellet and first coating of indomethacin and about 2% to 10% by weight of a binding agent; and (3) A second coating comprised of a mixture of ethyl cellulose and hydroxypropyl cellulose in a weight ratio range of about 50:50 to about 90:10.
Claim 2
Dependent Claim
88 words
An indomethacin controlled release formulation consisting essentially of: (a) one type of indomethacin containing pellet one which exhibits both immediate release and sustained release characteristics comprising (1) a non-pareil pellet; (2) a first coating comprised of about 5% to about 30% by weight of said pellet and first coating of indomethacin and about 2% to 10% by weight of a binding agent; and (3) A second coating comprised of a mixture of ethyl cellulose and hydroxypropyl cellulose in a weight ratio range of about 50:50 to about 90:10.
Claim 3
Dependent Claim
23 words
The formulation according to claim 1 wherein said binding agent comprises about 3% to 4% by weight of said pellet and first coating.
Claim 4
Dependent Claim
30 words
The formulation according to claim 1 wherein said mixture of ethyl cellulose and hydroxypropyl cellulose comprises about 2% to about 5% of the weight of said pellet and first coating.
Claim 5
Dependent Claim
25 words
The formulation according to claim 2 wherein said binding agent is selected from the group consisting of hydroxypropylmethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose and polyvinylpyrrolidone.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |