US3823168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs containing sulphonic acid groups
Assignee: Bayer AG
•
Filing: 1970-06-23
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Granted: 1974-07-09
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Expires: 1990-06-23
Abstract
Abstract DYESTUFFS WHICH CONTAINS SULPHONIC ACID GROUPS AND CORRESPOND TO THE FORMULA 1-(R1-CH(-R2)-NH-),4-((HO-SO2-)N-A-NH-),6-(HO-),7-R4-ANTH RAQUINONE IN WHICH R1 AND R2 DENOTE LOWER ALKYL RADICALS WITH 1-3 CARBON ATOMS, WHICH MAY BE SUBSTITUTED; A MEANS AN OPTIONALLY SUBSTITUED ALIPHATIC, CYCLOALIPHATIC, ARALIPHATIC, AROMATIC OR HETEROCYCLIC RADICAL; N STANDS FOR 0, 1 OR 2; AND R4 DENOTES A SULPHOC ACID WHEN N=1 OR 2. HYDROGEN OR A SULPHONIC ACID WHEN N=1 OR 2. THE DYESTUFFS ARE EMINENTLY SUITABLE FOR THE DYEING AND PRINTING OF NATURAL AND SYNTHETIC POLYAMIDE FIBRE MATERIALS.
Inventors
- 👤 W Hohmann
- 👤 K Wunderlich
- 👤 H Bien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:23
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/52; C09B1/523; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917; Y10S8/92; Y10S8/924
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |