US2645642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of
Assignee: —
•
Filing: —
•
Granted: 1953-07-14
•
Expires: 1970-07-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:22
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/54; C07D231/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF HYDROXY INDAZOLES WHICH COMPRISES HEATING THE CORRESPONDING AMINOINDAZOLE WITH DILUTE SULPHURIC ACID UNDER SUPER-ATMOSPHERIC PRESSURE AT A TEMPERATURE BETWEEN ABOUT 150* C. AND ABOUT 210 C. UNTIL THE REACTION IS SUBSTANTIALLY COMPLETED.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF HYDROXY INDAZOLES WHICH COMPRISES HEATING THE CORRESPONDING AMINOINDAZOLE WITH DILUTE SULPHURIC ACID UNDER SUPER-ATMOSPHERIC PRESSURE AT A TEMPERATURE BETWEEN ABOUT 150* C. AND ABOUT 210 C. UNTIL THE REACTION IS SUBSTANTIALLY COMPLETED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |