Patent US4581232A successfully refreshed from Google Patents.
US4581232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium trisilicate suitable for preparation of medicament adsorbates
Assignee: Warner Lambert Co LLC
•
Filing: 1983-07-20
•
Granted: 1986-04-08
•
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 07:44
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.
References Cited (Backward Citations)
FR799950A
Cited
US2881113A
Cited
US3085942A
Cited
US3352752A
Cited
US3337402A
Cited
US3337403A
Cited
US3449266A
Cited
US3567819A
Cited
US3636200A
Cited
GB1578541A
Cited
US4401674A
Cited
JPS5594315A
Cited
JPS55129224A
Cited
JPS5659707A
Cited
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 |