US2716648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydantoin derivatives
Assignee: —
•
Filing: —
•
Granted: 1955-08-30
•
Expires: 1972-08-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:53
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/10; C07D471/00; C07D471/02; C07D471/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A 7,8-BENZO - 1,3-DIAZASPIRO(4-5)DECANE - 2,4-DIONE HAVING THE FORMULA
Claim 2
Dependent Claim
9 words
A 7,8-BENZO - 1,3-DIAZASPIRO(4-5)DECANE - 2,4-DIONE HAVING THE FORMULA
References Cited (Backward Citations)
US2161928A
Cited
DE810394C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-29 | 1959-02-28 | 1959-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-29 | 1963-02-28 | 1963-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-29 | 1967-02-28 | 1967-08-30 | $7700.00 | Window Closed / Lapsed |