US2733246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing isonicotinic acid
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:40
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
AS A METHOD OF PRODUCING ISONICOTINIC ACID FROM THE PYROPHTHALONE OF GAMMA PICOLINE HAVING THE FORMULA:
Claim 2
Dependent Claim
16 words
AS A METHOD OF PRODUCING ISONICOTINIC ACID FROM THE PYROPHTHALONE OF GAMMA PICOLINE HAVING THE FORMULA:
References Cited (Backward Citations)
US2300741A
Cited
US2430804A
Cited
US2522163A
Cited
US2449906A
Cited
US2505568A
Cited
US2475969A
Cited
US2513099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |