Patent US3923774A successfully refreshed from Google Patents.
US3923774A
Expired / Lapsed
US
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Quinazolone containing phenyl-azo-pyridine compounds
Assignee: BASF SE
•
Filing: 1973-04-04
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Granted: 1975-12-02
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Expires: 1993-04-04
Abstract
Abstract Azo pigments of the formula: IN WHICH R1 is hydrogen, chloro, bromo or nitro; R2 and R3 are water-insoluble and are hydrogen or chloro; R4 is hydrogen, chloro or methyl; and X is cyano or carbamoyl. The pigments are eminently suitable for coloring resins, surface coatings or printing inks.
Inventors
- 👤 Peter Dimroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:29
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B29/3626; C09B29/363
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
7 words
A QUINAZOLONE AZO PIGMENT OF THE FORMULA
Claim 2
Dependent Claim
7 words
A QUINAZOLONE AZO PIGMENT OF THE FORMULA
Claim 3
Dependent Claim
22 words
An azo pigment as claimed in claim 1 where each of R1 to R4 is hydrogen and X is cyano or carbamoyl.
Claim 4
Dependent Claim
6 words
The azo pigment of the formula
Claim 5
Dependent Claim
6 words
The azo pigment of the formula
Claim 6
Dependent Claim
6 words
The azo pigment of the formula
Claim 7
Dependent Claim
6 words
The azo pigment of the formula
References Cited (Backward Citations)
GB961088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |