Patent US4024148A successfully refreshed from Google Patents.
US4024148A
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Crystalline form of quinacridone
Assignee: Sun Chemical Corp
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Filing: 1976-02-02
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Granted: 1977-05-17
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Expires: 1996-02-02
Abstract
Abstract A new crystalline form of quinacridone is prepared by conditioning crude quinacridone with a water-insoluble liquid having at least one hydroxyl group, a surfactant, and water.
Inventors
- 👤 Ronald S. Tyson
- 👤 Leonard Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:56
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0027; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A red crystalline linear quinacridone pigment characterized by an X-ray diffraction pattern exhibiting four strong lines corresponding to interplanar spacings of 14.3A, 6.4A, 3.46A, and 3.21A; a moderate line corresponding to interplanar spacing of 7.1A; three weak lines corresponding to interplanar spacings of 5.4A, 4.2A, and 2.35A; and two very weak lines corresponding to interplanar spacings of 5.0A and 4.4A.
Claim 2
Dependent Claim
60 words
A red crystalline linear quinacridone pigment characterized by an X-ray diffraction pattern exhibiting four strong lines corresponding to interplanar spacings of 14.3A, 6.4A, 3.46A, and 3.21A; a moderate line corresponding to interplanar spacing of 7.1A; three weak lines corresponding to interplanar spacings of 5.4A, 4.2A, and 2.35A; and two very weak lines corresponding to interplanar spacings of 5.0A and 4.4A.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |