US3560491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Bayer AG
•
Filing: 1967-07-10
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Granted: 1971-02-02
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Expires: 1987-07-10
Abstract
Abstract THIS INVENTION CONCERNS ANTHRAQUINONE DYESTUFFS OF THE FORMULA A(-NH-CH=C(-CN)-CO-N(-R1)-R2)N WHEREIN A IS AN ANTHRAQUINONE RADICAL, N IS AN INTEGER FROM 1 TO 4 AND R1 AND R2 COMPLETE THE RESIDUE OF ALIPHATIC OF HETEROCYCLIC AMINES. THE DYESTUFFS ARE PREPARED BY REACTION OF THE APPROPRIATE CYANOACETIC ACID AMIDE WITH N-ANTHRAQUINONYL-N-FORMAMIDIUM SALTS. THESE DYESTUFFS ARE USEFUL FOR DYING OR PRINTING OF TEXTILES.
Inventors
- 👤 Rutger Neeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:46
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/205; C09B1/56; C09B1/58; C09B5/00; C09B5/02; C09B5/04; C09B5/14; C09B5/16
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |