Patent US3879394A successfully refreshed from Google Patents.
US3879394A
Expired / Lapsed
US
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2,3-Dichloro-5,6-dicyanopyrazine and derivatives
Assignee: EIDP Inc
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Filing: 1973-09-25
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Granted: 1975-04-22
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Expires: 1993-09-25
Abstract
Abstract Certain amino derivatives of 2,3-dichloro-5,6-dicyanopyrazine are useful fluorescing agents.
Inventors
- 👤 Dennis Scott Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:23
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/14; C07D241/24; C07D241/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
A compound of the formula
Claim 2
Dependent Claim
5 words
A compound of the formula
Claim 3
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 4
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 5
Dependent Claim
10 words
A compound according to claim 1 where X NH2; 2-amino-3-chloro-5,6-dicyanopyrazine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |