US4725690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perylene-3,4,9,10-tetracarboxylic acid diimide dye
Assignee: BASF SE
•
Filing: 1986-06-20
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Granted: 1988-02-16
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Expires: 2006-06-20
Abstract
Abstract A novel perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR1## is very useful as a black dye or, together with white pigments, as a gray dye.
Inventors
- 👤 Fritz Graser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:09
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
Perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR3##
Claim 2
Dependent Claim
7 words
Perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR3##
References Cited (Backward Citations)
US4599408A
Cited
US4517270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |