US4479906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trisazo dye
Assignee: BASF SE
•
Filing: 1973-11-07
•
Granted: 1984-10-30
•
Expires: 1993-11-07
Abstract
Abstract Trisazo dyes containing sulfo groups and having the formula: <IMAGE> which for the most part give black colorations on paper and particularly on leather and are therefore especially useful as leather dyes.
Inventors
- 👤 Georg Zeidler
- 👤 Guenter Hansen
- 👤 Wolfgang Schulte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:25
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/38; C09B35/44; C09B35/46; C09B35/467; C09B35/465; C09B35/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
The dye of the formula ##STR233##
Claim 2
Dependent Claim
6 words
The dye of the formula ##STR233##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |