Patent US3679684A successfully refreshed from Google Patents.
US3679684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yellow pigments
Assignee: EIDP Inc
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Filing: 1969-04-17
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Granted: 1972-07-25
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Expires: 1989-04-17
Abstract
Abstract 1,1''-BIS(2,4-DIHYDROXYQUINOLINE-3-CARBOXAMIDE)4,4''DIANTHRAQUINONYL WHICH MAY BE REPRESENTED BY THE FOLLOWING STRUCTURAL FORMULA 1,4-BIS(2,4-DIHYDROXYQUINOLINE-3-CARBOXAMIDO)ANTHRAQUINONE WHICH MAY BE REPRESENTED BY THE FOLLOWING STRUCTURAL FORMULA Yellow pigments are produced by reacting a 3-alkoxy-carbonyl2,4-dihydroxyquinoline, such as 3-ethoxycarbonyl-2,4dihydroxyquinoline, and a diaminoanthraquinone, such as 1,5diaminoanthraquinone, 1,4-diaminoanthraquinone, or 1,1-diamino4,4''-dianthraquinonyl. Typical compounds of this invention are: 1,5-Bis(2,4-dihydroxyquinoline-3-carboxamido)anthraquinone which may be represented by the following structural formula
Inventors
- 👤 Pritam Singh Dhaliwal
- 👤 Edward E Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:02
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/44; C09B6/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
3 words
The compound 1,4-bis(2,4-dihydroxyquinoline-3-carboxamido)anthraquinone.
Claim 2
Dependent Claim
3 words
The compound 1,1''-bis(2,4-dihydroxyquinoline-3-carboxamido)-4,4''-dianthraquinonyl.
Claim 3
Dependent Claim
42 words
The compound of claim 1 in a polymorphic modification defined by the following X-ray diffraction data: Interplanar spacing, A Intensity 6.15 strong 5.68 strong 4.92 weak 3.70 medium 3.42 strong 3.08 weak 2.81 medium 1.89 strong 1.81 strong 1.72 strong 1.60 strong
Claim 4
Dependent Claim
42 words
The compound of claim 1 in a polymorphic modification defined by the following X-ray diffraction data: Interplanar spacing, A Intensity 6.15 medium 4.62 weak 3.56 strong 3.42 weak 3.10 weak 2.34 very weak 2.04 very weak 1.92 strong 1.76 strong 1.72 strong
Claim 5
Dependent Claim
57 words
The process of preparing a bis(2,4-dihydroxy-quinoline-3-carboxamido)anthraquinone consisting essentially of mixing a 3-alkoxycarbonyl-2,4-dihydroxyquinoline wherein the alkoxy group has from 1 to 3 carbon atoms and a diaminoanthraquinone selected from the group consisting of 1,5-diaminoanthraquinone, 1,4-diaminoanthraquinone and 1,1''-diamino-4,4''-dianthraquinonyl in an inert organic solvent medium and heating the mixture at a temperature ranging from about 100* C. to 220* C.
Claim 6
Dependent Claim
10 words
The process of claim 6 wherein the 3-alkoxy-carbonyl-2,4-dihydroxyquinoline is 3-ethoxycarbonyl-2,4-di-hydroxyquinoline.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |