US4195020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dichloro-phenyl-azo-acetoacetylamino-benzimidazolone pigments
Assignee: Hoechst AG
•
Filing: 1979-02-23
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Granted: 1980-03-25
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Expires: 1999-02-23
Abstract
Abstract A pigment of the formula ##STR1## wherein R 1 is hydrogen, chlorine or methyl and R 2 is hydrogen or methyl. These pigments have a high color strength, fastness to overvarnishing, fastness to migration and fastness to light and weathering. They can be used in all fields in which pigments are used as coloring material, especially for the coloring of lacquers with metal-effect.
Inventors
- 👤 Klaus Hunger
- 👤 Joachim Ribka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:18
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/32; C09B29/33; C09B29/335; C09B29/338
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
A mono azo pigment of the formula ##STR3## wherein R 1 is hydrogen, chlorine or methyl.
Claim 2
Dependent Claim
16 words
A mono azo pigment of the formula ##STR3## wherein R 1 is hydrogen, chlorine or methyl.
Claim 3
Dependent Claim
10 words
The mono azo pigment of claim 1 which is ##STR4##
Claim 4
Dependent Claim
10 words
The mono azo pigment of claim 1 which is ##STR5##
Claim 5
Dependent Claim
10 words
The mono azo pigment of claim 1 which is ##STR6##
References Cited (Backward Citations)
US3109842A
Cited
DE1808017A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |