US2874156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted l
Assignee: —
•
Filing: —
•
Granted: 1959-02-17
•
Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:19
CPC Classifications
C; C07; C07D; C07D237/00; C07D237/26; C07D237/30; C07D237/32; C07F; C07F15/00; C07F15/06; C07F15/065
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
6 words
A 2,3-DIPHENYL-1,4-DIOXOTETRAHYDROPHTHALAZINE OF THE GENERAL 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) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |