US2525518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dimethylaminoantipyrines
Assignee: Rhone Poulenc SA
•
Filing: 1947-09-30
•
Granted: 1950-10-10
•
Expires: 1967-09-30
Abstract
No abstract record available.
Inventors
- 👤 Bouvier Maurice Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:34
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/44; C07D231/46; C07D231/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A PROCESS FOR THE PREPARATION OF 1-PHENYL2:3-DIMETHYL-4-DIMETHYLAMINOPYRAZOLONE WHICH COMPRISES REDUCTION AND METHYLATION OF 1PHENYL - 2:3 - DIMETHYL - 4 - METHYLENEAMINOPYRAZOLONE.
Claim 2
Dependent Claim
22 words
A PROCESS FOR THE PREPARATION OF 1-PHENYL2:3-DIMETHYL-4-DIMETHYLAMINOPYRAZOLONE WHICH COMPRISES REDUCTION AND METHYLATION OF 1PHENYL - 2:3 - DIMETHYL - 4 - METHYLENEAMINOPYRAZOLONE.
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |