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US3793327A
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US
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Alpha-2,9-difluoroquinacridone
Assignee: Novartis Corp
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Filing: 1972-02-04
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Granted: 1974-02-19
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Expires: 1992-02-04
Abstract
Abstract THE COMPOUND 2,9-DIFLUOROQUINACRIDONE IS PREPARED IN A NOVEL POLYMORPHIC FORM (REFERRED TO HEREIN AS THE "A" CRYSTAL FROM) CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING: LINES OF STRONG INTENSITY WITH INTERPLANAR SPACING OF 7.90 A. AND 3.24 A.; LINES OF INTERMEDIATE INTENSITY WITH INTERPLANAR SPACINGS OF 15.11 A., 6.46 A., 3.74 A.; AND LINES OF WEAK INTENSITY WITH INTERPLANAR SPACINGS OF 7.96 A., 5.27 A., 4.25 A., 3.97 A., 3.52 A. THE COMPOUND IS FIRTHER CHARACTERIZED BY A BRILITANT VIOLET HUE; HENCE, IS WELL SUITED FOR PIGMENTARY USES.
Inventors
- 👤 E Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:41
CPC Classifications
C; C09; C09B; C09B67/00; C09B48/00; C09B67/0025; C09B67/0027; C09B67/0033; C09B67/0034; C09B67/0036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |