US3558593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble monoazo dyestuffs and process for preparing them
Assignee: Hoechst AG
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Filing: 1967-07-18
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Granted: 1971-01-26
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Expires: 1987-07-18
Abstract
Abstract WATER-INSOLUBLE MONOAZO DYESTUFFS OF THE GENERAL FORMULA 1-((2-Y,4-X-PHENYL)-N=N-),2-(R1-CO-NH-),4-(R3-CO-CH2- CH(-R2)-NH-)BENZENE WHEREIN X REPRESENTS A NITRO OR NITRILE GROUP, Y REPRESENTS A HYDROGEN A HALOGEN ATOM, OR A NITRO OR NITRILE GROUP, R1 REPRESENTS A LOWER ALKYL OR PHENYL RADICAL, R2 REPRESENTS A METHYL, PHENYL, CHLOROPHENYL, HYDROXYPHENYL OR METHYLENEDIOXYPHENYL RADICAL, AND R3 REPRESENTS A METHYL, PHENYL, HYDROXYPHENYL OR LOWER ALKOXY GROUP, AND A PROCESS FOR PREPARING SAID DYESTUFFS.
Inventors
- 👤 Helmut Lindner
- 👤 Karl Sommer
- 👤 Heinz Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:57
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/06; C09B29/08
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |