US4695591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release dosage forms comprising hydroxypropylmethylcellulose
Assignee: Merck Sharp & Dohme LLC
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Filing: 1985-11-22
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Granted: 1987-09-22
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Expires: 2005-11-22
Abstract
Abstract Controlled release solid dosage forms comprising less than about one-third of the total dosage form weight of hydroxypropylmethylcellulose USP 2910 are disclosed.
Inventors
- 👤 Gayda Hanna
- 👤 Winston A. Vadino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:37
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2054; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; A61K9/2009
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
A controlled release dosage form comprising a combination of an analgesic-effective amount of acetaminophen, an anti-histaminic-effective amount of dexbrompheniramine maleate, a decongestive-effective amount of pseudoephedrine sulfate and hydroxypropyl methylcellulose U.S.P. 2910 as the carrier base, wherein said hydroxypropyl methylcellulose constitutes 4.6 to 12 weight-% of the total dosage form.
Claim 2
Dependent Claim
49 words
A controlled release dosage form comprising a combination of an analgesic-effective amount of acetaminophen, an anti-histaminic-effective amount of dexbrompheniramine maleate, a decongestive-effective amount of pseudoephedrine sulfate and hydroxypropyl methylcellulose U.S.P. 2910 as the carrier base, wherein said hydroxypropyl methylcellulose constitutes 4.6 to 12 weight-% of the total dosage form.
Claim 3
Dependent Claim
20 words
A dosage form of claim 1 wherein the hydroxypropyl methylcellulose constitutes 4.6 to 8 weight-% of the total dosage form.
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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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |