US3814757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamino substituted dicyano pyrazines and process
Assignee: EIDP Inc
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Filing: 1972-03-06
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Granted: 1974-06-04
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Expires: 1992-03-06
Abstract
Abstract CERTAIN NOVEL DICYANO- AND TRICYANO-PYRAZINES ARE OBTAINED BY REPLACING ONE OR TWO CYANO GROUPS OF TETRACYANOPYRAZINE. THE COMPOUNDS ARE FLUORESCENT AND CAN BE USED TO PREPARE POLYMERS.
Inventors
- 👤 D Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5046; C08G59/5053; C08G59/5073
Claims Analysis
Total Claims: 0
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |