US2769821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,4-naphthoquinoneimine compounds and methods of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1953-05-21
•
Granted: 1956-11-06
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Expires: 1973-05-21
Abstract
No abstract record available.
Inventors
- 👤 Joe H Clark
- 👤 Jackson P English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:01
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/01; C07C311/02; C07C46/00; C07C50/00; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 1,4-NAPHTHOQUINONEIMINES REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
12 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 1,4-NAPHTHOQUINONEIMINES REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
DE595327C
Cited
US2153956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |