US3980677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs containing sulphonic acid groups
Assignee: Bayer AG
•
Filing: 1975-09-18
•
Granted: 1976-09-14
•
Expires: 1995-09-18
Abstract
Abstract Dyestuffs which contain sulphonic acid groups and correspond to the formula ##SPC1## In which R 1 and R 2 denote lower alkyl radicals with 1 - 3 carbon atoms, which may be substituted; A means an optionally substituted aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical; n stands for 0, 1 or 2; and R 4 denotes a sulphonic acid group when n = 0 and denotes 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 fiber materials.
Inventors
- 👤 Walter Hohmann
- 👤 Klaus Wunderlich
- 👤 Hans-Samuel Bien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:14
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: 3
Claim 1
Independent Claim
80 words
Dyestuff which contains sulfonic acid groups and has the following formula: ##SPC45## wherein R 1 and R 2 are alkyl of 1-3 carbon atoms or substituted alkyl of 1-3 carbon atoms where the substituent is hydroxy or sulphato; R 4 is hydrogen or sulfonic acid; and B is alkyl of 1-6 carbon atoms, allyl, hydroxyethyl, methoxyethyl, aminoethyl, methylaminoethyl, w-carboxypropyl, cyanoethyl, sulphatoethyl, cyclohexyl, hydroxycyclohexyl, 4-methoxycyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, or 4-aminocyclohexyl; and B must contain sulfonic acid group when R 4 is hydrogen.
Claim 2
Dependent Claim
80 words
Dyestuff which contains sulfonic acid groups and has the following formula: ##SPC45## wherein R 1 and R 2 are alkyl of 1-3 carbon atoms or substituted alkyl of 1-3 carbon atoms where the substituent is hydroxy or sulphato; R 4 is hydrogen or sulfonic acid; and B is alkyl of 1-6 carbon atoms, allyl, hydroxyethyl, methoxyethyl, aminoethyl, methylaminoethyl, w-carboxypropyl, cyanoethyl, sulphatoethyl, cyclohexyl, hydroxycyclohexyl, 4-methoxycyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, or 4-aminocyclohexyl; and B must contain sulfonic acid group when R 4 is hydrogen.
Claim 3
Dependent Claim
8 words
Dyestuff of claim 1 of the formula ##SPC46##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |