US2740780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chzx c chxxchj
Assignee: —
•
Filing: —
•
Granted: 1956-04-03
•
Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:21
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/04; C07D249/00; C07D249/02; C07D249/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
14 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A HETEROCYCLIC BASE HAVING THE FORMULA
References Cited (Backward Citations)
US2666050A
Cited
DE611248C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |