Patent US4520009A successfully refreshed from Google Patents.
US4520009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained released aspirin formulation
Assignee: Verex Laboratories Inc
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Filing: 1983-11-28
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Granted: 1985-05-28
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Expires: 2003-11-28
Abstract
Abstract A constant release aspirin tablet comprising from 85-95 weight percent of aspirin, from 1.5-5 weight percent of microcrystalline cellulose, from 1-10 weight percent of cellulose acetate phthalate, from 0.75-4 weight percent of a plasticizer, from 0.75-5 weight percent of corn starch, and from 0.5 to 2 percent of a lubricant.
Inventors
- 👤 James M. Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:50
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2054
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A constant release aspirin tablet comprising from 85-95 weight percent of aspirin, from 1.5-5 weight percent of microcrystalline cellulose, from 1-10 weight percent of cellulose acetate phthalate, from 0.75-4 weight percent of a plasticizer, from 0.75-5 weight percent of a pharmaceutically acceptable diluent, and from 0.5 to 2 percent of a lubricant.
Claim 2
Dependent Claim
52 words
A constant release aspirin tablet comprising from 85-95 weight percent of aspirin, from 1.5-5 weight percent of microcrystalline cellulose, from 1-10 weight percent of cellulose acetate phthalate, from 0.75-4 weight percent of a plasticizer, from 0.75-5 weight percent of a pharmaceutically acceptable diluent, and from 0.5 to 2 percent of a lubricant.
Claim 3
Dependent Claim
16 words
The aspirin tablet of claim 1 wherein said plasticizer is a high molecular weight polyethylene glycol.
Claim 4
Dependent Claim
13 words
The aspirin tablet of claim 1 wherein said plasticizer is polyethylene glycol 8000.
Claim 5
Dependent Claim
12 words
The aspirin tablet of claim 1 wherein the diluent is corn starch.
Claim 6
Dependent Claim
12 words
The aspirin tablet of claim 2 wherein the diluent is corn starch.
Claim 7
Dependent Claim
12 words
The aspirin tablet of claim 3 wherein the diluent is corn starch.
Claim 8
Dependent Claim
11 words
The aspirin tablet of claim 1 wherein said lubricant is talc.
Claim 9
Dependent Claim
11 words
The aspirin tablet of claim 3 wherein said lubricant is talc.
Claim 10
Dependent Claim
11 words
The aspirin tablet of claim 4 wherein said lubricant is talc.
Claim 11
Dependent Claim
11 words
The aspirin tablet of claim 5 wherein said lubricant is talc.
Claim 12
Dependent Claim
11 words
The aspirin tablet of claim 6 wherein said lubricant is talc.
Claim 13
Dependent Claim
54 words
A constant order release aspirin tablet comprising from 85-95 weight percent of aspirin, from 1.5-5 weight percent of microcrystalline cellulose, from 1-10 weight percent of cellulose acetate phthalate, from 0.75-4 weight percent of polyethylene glycol 8000, from 0.75 to 5 weight percent of corn starch and from 0.5 to 2 weight percent of talc.
Claim 14
Dependent Claim
54 words
A constant order release aspirin tablet comprising from 85-95 weight percent of aspirin, from 1.5-5 weight percent of microcrystalline cellulose, from 1-10 weight percent of cellulose acetate phthalate, from 0.75-4 weight percent of polyethylene glycol 8000, from 0.75 to 5 weight percent of corn starch and from 0.5 to 2 weight percent of talc.
References Cited (Backward Citations)
US4375468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |