US4581232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium trisilicate suitable for preparation of medicament adsorbates
Assignee: Warner Lambert Co LLC
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Filing: 1983-07-20
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Granted: 1986-04-08
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Expires: 2003-07-20
Abstract
Abstract A medicament adsorbate containing a magnesium trisilicate having a surface area of at least 400 m2/g and having a flake-like structure with multiple interstitial spaces, and having adsorbed therein from about 1% to about 20% by weight of the adsorbate of a medicament drug.
Inventors
- 👤 David Peters
- 👤 John Denick, Jr.
- 👤 Anil K. Talwar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:44
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; A61K9/141; A61K9/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A medicament adsorbate consisting essentially of magnesium trisilicate having a surface area of at least 400 m 2 /g and having a flake-like structure with multiple interstitial spaces, and containing adsorbed therein from about 1% to about 20% by weight of the adsorbate of a medicament drug wherein the medicament drug is an antitussive selected from the group consisting of dextromethorphan, dextromethorphan hydrobromide and mixtures thereof.
Claim 2
Dependent Claim
66 words
A medicament adsorbate consisting essentially of magnesium trisilicate having a surface area of at least 400 m 2 /g and having a flake-like structure with multiple interstitial spaces, and containing adsorbed therein from about 1% to about 20% by weight of the adsorbate of a medicament drug wherein the medicament drug is an antitussive selected from the group consisting of dextromethorphan, dextromethorphan hydrobromide and mixtures thereof.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |