Patent US3741970A successfully refreshed from Google Patents.
US3741970A
Expired / Lapsed
US
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Linear alkyl-amido transquinacridone pigments
Assignee: Hoechst AG
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Filing: 1970-12-03
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Granted: 1973-06-26
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Expires: 1990-12-03
Abstract
Abstract LINEAR TRANS-QUINACRIDONES OF THE GENERAL FORMULA 7,14-DI(O=),2,9-DI(R-NH-CO-)-5,7,12,14-TETRAHYDROQUINO- (2,3-B)ACRIDINE WHEREIN R IS ETHYL, N-BUTYL OR N-HEXYL AND PROCESS FOR PREPARING THEM. SAID PIGMENTS HAVE PURE BLUISH RED VIOLET SHADES AND ARE EXCELLENTLY SUITED FOR GETTING PIGMENTS OF NEUTRAL RED SHADES BY MIXING THEM WITTH MOLYBDATE ORANGE.
Inventors
- 👤 O Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:27
CPC Classifications
C; C09; C09B; C09B48/00
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |