US3741971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water insoluble benzoxanthene dicarboxylic acid imide dyestuffs and process for preparing them
Assignee: Hoechst AG
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Filing: 1971-05-10
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Granted: 1973-06-26
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Expires: 1991-05-10
Abstract
Abstract BENZOXANTHENE-DICARBOXYLIC ACID IMIDE DYESTUFFS WHICH DYESTUFFS HAVE A YELLOW TO GREENISH YELLOW SHADE AND ARE EXCELLENTLY SUITED AS FLUORESCENT DYESTUFFS FOR DYEING IN THE MASS OF SYNTHETIC POLYMERS AND FOR THE PREPARATION OF DAYLIGHT LUMINOUS PAINTS. MOREOVER, THEY CAN BE USED FOR THE DYEING OF POLYETHYLENE GLYCOL TERPTHALATE AND ACETYL CELLULOSE.
Inventors
- 👤 O Fuchs
- 👤 H Troster
Bibliographic Details
Application Number
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Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
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Claims Analysis
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References Cited (Backward Citations)
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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) | 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 |