Patent US3772303A successfully refreshed from Google Patents.
US3772303A
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US
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Cis-naphthoylene-bis-benzimidazole pigment and process for its manufacture
Assignee: Hoechst AG
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Filing: 1971-08-05
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Granted: 1973-11-13
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Expires: 1991-08-05
Abstract
Abstract THE PRESENT INVENTION PROVIDES A NAPHTHOYLENE-BISBENZIMIDAZOLE PIGMENT IN A NEW AND VALUABLE B-MODIFICATION, WHICH IS CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN WITH MAXIMUMS OF HIGH INTENSITY AT THE DIFFRACTION ANGLES OF 4.3*, 6.65* AND 13.45* AND MAXIMUMS OF MEDIUM INTESITY AT THE DIFFRACTION ANGLES OF 4.8*, 12.1* AND 14.45*, MEASURED WITH CU-K A-IRRADIATION. THE INVENTION FURTHERMORE PROVIDES A PROCESS FOR THE MANUFACTURE OF THE ABOVE SPECIFIED PIGMENT, WHEREIN CRUDE CIS-NAPHTHOYLENE-BIS-BENZIMIDAZOLE IS HEATED IN WATER AND/OR A SOLVENT TO TEMPERATURES IN THE RANGE OF ABOUT 100* TO 250* AND THE PIGMENT THUS OBTAINED IS ISOLATED IN THE USUAL MANNER.
Inventors
- 👤 E Spietschka
- 👤 J Landler
- 👤 D Wager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:39
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/22; C09; C09B; C09B57/00; C09B57/12; C09B67/00; C09B67/0025
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |