US2959606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aluminum acetylsalicylate
Assignee: Lewis Howe Co
•
Filing: 1956-09-18
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Granted: 1960-11-08
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Expires: 1976-09-18
Abstract
No abstract record available.
Inventors
- 👤 Arun K Mitra
- 👤 Courtney G Pitkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:48
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF PRODUCING SUBSTANTIALLY PURE MONOHYDROXY ALUMINUM SALT OF ASPIRIN WHICH CONSISTS ESSENTIALLY OF THE STEPS OF DISSOLVING ABOUT 2 MOLS OF ASPIRIN IN ALCOHOL, DISSOLVING ABOUT 1 MOL OF ALUMINUM ISOPROPYLATE IN TOLUENE, THROUGHLY MIXING TOGETHER THE TWO SOLUTIONS, GRADUALLY ADDING WATER TO THE MIXED SOLUTIONS UNTIL THE MONO-HYDROXY ALUMINUM SALT OF ASPIRIN IS PRECIPITATED, AND THEN FILTERING THE PRECIPITATE, WASHING IT WITH ALCOHOL, AND DRYING IT.
Claim 2
Independent Claim
69 words
THE METHOD OF PRODUCING SUBSTANTIALLY PURE MONOHYDROXY ALUMINUM SALT OF ASPIRIN WHICH CONSISTS ESSENTIALLY OF THE STEPS OF DISSOLVING ABOUT 2 MOLS OF ASPIRIN IN ALCOHOL, DISSOLVING ABOUT 1 MOL OF ALUMINUM ISOPROPYLATE IN TOLUENE, THROUGHLY MIXING TOGETHER THE TWO SOLUTIONS, GRADUALLY ADDING WATER TO THE MIXED SOLUTIONS UNTIL THE MONO-HYDROXY ALUMINUM SALT OF ASPIRIN IS PRECIPITATED, AND THEN FILTERING THE PRECIPITATE, WASHING IT WITH ALCOHOL, AND DRYING IT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |