Patent US4601895A successfully refreshed from Google Patents.
US4601895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed-action acetylsalicylic acid formulations for oral administration
Assignee: Bayer AG
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Filing: 1984-12-06
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Granted: 1986-07-22
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Expires: 2004-12-06
Abstract
Abstract A delayed-action acetylsalicylic acid formulation comprising by weight 60 to 90% of acetylsalicylic acid, 8 to 40% pregelatinized starch, and 0 to 30% of additives. The amount of starch controls the rate of release.
Inventors
- 👤 Bernhard Streuff
- 👤 Johann Putter, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:05
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K31/00; A61K31/60; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2059; A61P; A61P25/00; A61P25/04; A61P29/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A acetylsalicylic acid directly compressed dry mixture tablet formulation consisting essentially of by weight 60 to 90% of acetylsalicylic acid, 8 to 40% pregelatinized starch, and 0 to 30% of cellulose powder and cornstarch additives.
Claim 2
Dependent Claim
35 words
A acetylsalicylic acid directly compressed dry mixture tablet formulation consisting essentially of by weight 60 to 90% of acetylsalicylic acid, 8 to 40% pregelatinized starch, and 0 to 30% of cellulose powder and cornstarch additives.
Claim 3
Dependent Claim
26 words
An acetylsalicylic acid formulation according to claim 1, consisting essentially of by weight 70 to 88% of acetylsalicylic acid and 12 to 30% of pregelatinized starch.
Claim 4
Dependent Claim
20 words
An acetylsalicylic acid formulation according to claim 1, consisting essentially of about 70 to 80% of acetylsalicylic acid by weight.
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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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |