US2669581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of resorcylic acid
Assignee: Wyeth Holdings LLC
•
Filing: 1951-07-27
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Granted: 1954-02-16
•
Expires: 1971-07-27
Abstract
No abstract record available.
Inventors
- 👤 Scalera Mario
- 👤 Tsang Sien Moo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/367
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A SINGLE-STEP PROCESS OF CONVERTING P-AMINOSALICYLIC ACID TO RESORCYLIC ACID WHICH COMPRISES ADDING AN ALKALI METAL NITRITE AND P-AMINOSALICYLIC ACID SIMULTANEOUSLY TO A HOT AQUEOUS MINERAL ACID SOLUTION MAINTAINED AT A TEMPERATURE ABOVE 60* C.
Claim 2
Dependent Claim
35 words
A SINGLE-STEP PROCESS OF CONVERTING P-AMINOSALICYLIC ACID TO RESORCYLIC ACID WHICH COMPRISES ADDING AN ALKALI METAL NITRITE AND P-AMINOSALICYLIC ACID SIMULTANEOUSLY TO A HOT AQUEOUS MINERAL ACID SOLUTION MAINTAINED AT A TEMPERATURE ABOVE 60* C.
References Cited (Backward Citations)
GB567217A
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 |