Patent US2744897A successfully refreshed from Google Patents.
US2744897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic carbamates and method for their
Assignee: —
•
Filing: —
•
Granted: 1956-05-08
•
Expires: 1973-05-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:13
CPC Classifications
C; C07; C07D; C07D513/00; C07D513/02; C07D513/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE METHOD OF PREPARING A CYCLIC CARBAMATE REPRESENTED BY THE GENERAL FORMULA
Claim 2
Independent Claim
12 words
THE METHOD OF PREPARING A CYCLIC CARBAMATE REPRESENTED BY THE GENERAL FORMULA
References Cited (Backward Citations)
US2297520A
Cited
FR961754A
Cited
DE713467C
Cited
US2181663A
Cited
US2241321A
Cited
FR906181A
Cited
US2514219A
Cited
US2648664A
Cited
US2658886A
Cited
DK61475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |