US3801606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyes
Assignee: Bayer AG
•
Filing: 1970-05-25
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Granted: 1974-04-02
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Expires: 1990-05-25
Abstract
Abstract NOVEL DYES WHICH ARE 1,4-DIHYDROXY-8-AMINO-ANTHRAQUINONES HAVING IN THE 5-POSITION AN UNSUBSTITUTED OR SUBSTITUTED AMINO GROUP AND IN THE 7-POSITION AS ALKOXY, PHENOXY, MERCAPTO OR THIOPHENYL GROUP, ARE PRODUCED BY REACTING A 1,4-DIHYDROXY-8-AMINO-ANTHRAQUINONE WHICH CONTAINS IN THE 5-POSITION AN UNSUBSTITUTED OR SUBSTITUTED AMINO GROUP AND IN THE 7-POSITION A HALOGEN, PHENOXY OR SULFONIC ACID GROUP WITH A MERCAPTAN, THIOPHENOL, ALCOHOL OR PHENOL. AFFINITY OF THE DYES CAN THE IMPROVED BY HALOGENATION.
Inventors
- 👤 H Bien
- 👤 H Leister
- 👤 W Hohmann
- 👤 H Vollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:22
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/54; C09B1/547; C09B1/545; C09B1/56; C09B1/58; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/922; Y10S8/924
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |