US2852523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5, 5-diphenyl-1, 2, 4-oxadiazolidine-3-ones
Assignee: Wyeth Holdings LLC
•
Filing: 1957-09-13
•
Granted: 1958-09-16
•
Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
- 👤 Lopresti Rocco Joseph
- 👤 Safir Sidney Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
C; C07; C07D; C07D271/00; C07D271/02; C07D271/06; C07D271/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
5,5-DIPHENYL-1,2,4-OXADIAZOLIDINE-3-ONES OF THE FORMULA:
Claim 2
Dependent Claim
4 words
5,5-DIPHENYL-1,2,4-OXADIAZOLIDINE-3-ONES OF THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |