Patent US2857434A successfully refreshed from Google Patents.
US2857434A
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Dihydroanthracenedicarboxaldehydes and process of preparing
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-10-04
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Granted: 1958-10-21
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Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Tad L Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:42
CPC Classifications
C; C07; C07C; C07C47/00; C07C47/38; C07C47/44; C07C47/445; C07C35/00; C07C35/22; C07C35/23; C07C35/28; C07C35/29; C07C45/00; C07C45/27; C07C45/29; C07C45/296
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
THE DIHYDROANTHRACENEDICARBOXALDEHYDES 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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |