US2683718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiro-[xanthene-9, 4'-imidazolidine]-2, 5-dione
Assignee: GD Searle LLC
•
Filing: 1952-01-11
•
Granted: 1954-07-13
•
Expires: 1972-01-11
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Dornfeld
- 👤 Werner J Heidtke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
THE COMPOUNDS OF THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
6 words
THE COMPOUNDS OF THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US2409754A
Cited
US2461038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |