Patent US2681918A successfully refreshed from Google Patents.
US2681918A
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Diarylbenzoquinonediimine dioxides
Assignee: EIDP Inc
•
Filing: 1951-09-27
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Granted: 1954-06-22
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Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 Charles J Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:49
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/23; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
AN N,N'' - DIARYL-1,4-BENZOQUINONEDIMINEN,N''-DIOXIDE HAVING THE FORMULA:
Claim 2
Dependent Claim
7 words
AN N,N'' - DIARYL-1,4-BENZOQUINONEDIMINEN,N''-DIOXIDE HAVING 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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |