US3872077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo pigments form a 1-aminoanthraquinone diazo component and a phthalimidacetoacetanilide coupling component
Assignee: BASF SE
•
Filing: 1973-04-23
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Granted: 1975-03-18
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Expires: 1993-04-23
Abstract
Abstract WHEREIN R1 is H, Cl in the 3- or 4- position to the azo group and R2 is a phthalimide group in the meta-or para position. The yellow pigments are suitable for coloring surface coatings and plastics and for the production of printing inks. The pigments have excellent light fastness properties, weather fastness properties and fastness to over spraying. Azo pigments of the formula:
Inventors
- 👤 Peter Dimroth
- 👤 Joerg Redeker
- 👤 Wolfgang Lotsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:49
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/32; C09B29/33; C09B29/335; C09B29/337
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
AN AZO PIGMENT OF THE FORMULA:
Claim 2
Dependent Claim
6 words
AN AZO PIGMENT OF THE FORMULA:
Claim 3
Dependent Claim
6 words
The azo pigment of the formula:
Claim 4
Dependent Claim
6 words
The azo pigment of the formula:
References Cited (Backward Citations)
US2820787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |