Patent US2803640A successfully refreshed from Google Patents.
US2803640A
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Alpha-cyanovinyl-substituted aryl amines and their preparation
Assignee: EIDP Inc
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Filing: 1954-11-12
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Granted: 1957-08-20
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Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Richard E Heckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:57
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09B; C09B23/00; C09B23/14; C09B23/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
AN AROMATIC AMINE REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
7 words
AN AROMATIC AMINE REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
US2206108A
Cited
US2307700A
Cited
US2538008A
Cited
US2666780A
Cited
US2554484A
Cited
US2701260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |