US2669580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of p-alkoxysalicylic acids
Assignee: Wyeth Holdings LLC
•
Filing: 1951-07-11
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Granted: 1954-02-16
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Expires: 1971-07-11
Abstract
No abstract record available.
Inventors
- 👤 Robert S Long
- 👤 Nancy P Buckwalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:59
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/01; C07C65/03; C07C65/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS OF PRODUCING A P-LOWER ALKOXYSALICYLIC ACID WHICH COMPRISES INTRODUCING SIMULTANEOUSLY P-AMINOSALICYLIC ACID AND A NITRITE INTO A LOWER ALKANOL SOLUTION OF MINERAL ACID MAINTAINED AT A TEMPERATURE GREATER THAN 60* C., THE REACTION MIXTURE CONTAINING NOT MORE THAN 35% BY WEIGHT OF WATER BASED ON THE LOWER ALKANOL.
Claim 2
Dependent Claim
50 words
A PROCESS OF PRODUCING A P-LOWER ALKOXYSALICYLIC ACID WHICH COMPRISES INTRODUCING SIMULTANEOUSLY P-AMINOSALICYLIC ACID AND A NITRITE INTO A LOWER ALKANOL SOLUTION OF MINERAL ACID MAINTAINED AT A TEMPERATURE GREATER THAN 60* C., THE REACTION MIXTURE CONTAINING NOT MORE THAN 35% BY WEIGHT OF WATER BASED ON THE LOWER ALKANOL.
References Cited (Backward Citations)
GB567217A
Cited
US2461701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |