Patent US3274185A successfully refreshed from Google Patents.
US3274185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalazine derivatives
Assignee: The SE Massengill Co
•
Filing: 1965-05-03
•
Granted: 1966-09-20
•
Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Max V Sigal
- 👤 Marchini Paolo
- 👤 Buford L Poet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:58
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
10 words
6,7-DIMETHOXY-1,4-DIHYDROXY PHTHALAZINE. 6. 1-(3'',4'',5'', - TRIMETHOXYBENZYLIDENE) - 2-(3",4"-DIMETHOXYBENZYL) PHTHALAZINYL HYDRAZINE.
References Cited (Backward Citations)
US2484029A
Cited
US3012033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |