US2726248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-amino pyrazolines and process
Assignee: ILFROD Ltd
•
Filing: 1954-05-17
•
Granted: 1955-12-06
•
Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Duffin George Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A COMPOUND CONFORMING TO THE TAUTOMERIC GENERAL FORMULAE:
Claim 2
Dependent Claim
8 words
A COMPOUND CONFORMING TO THE TAUTOMERIC GENERAL FORMULAE:
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |