US3725384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted phenyl-azo-phenyl-azo-phenyl compounds
Assignee: Novartis AG
•
Filing: 1970-04-10
•
Granted: 1973-04-03
•
Expires: 1990-04-10
Abstract
Abstract Disazo compounds of the formula IN WHICH R1 and R6 each represents a hydrogen or a halogen atom or a nitro, alkyl or alkoxy group, R2, R3, R4 and R5 each represents a hydrogen atom or an alkyl or alkoxy group, X represents an amino group bound to the -SO2 bridge by way of its nitrogen atom and Y represents an alkyl group or a group of the formula B-SO2-, in which B represents a low-molecular alkyl group or a benzene residue and in which the benzene ring A can be fused to another benzene ring and the Y-O group is in ortho- or paraposition to the azo bridge, are valuable dyestuffs suitable for the spin-coloration of cellulose esters.
Inventors
- 👤 C Zickendraht
- 👤 A Fasciati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:25
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/28; C09B31/00; C09B31/02; C09B31/06; C09B31/062; C09B31/065; C09B43/18; C09B43/24; C09B43/32; C09B43/325
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
Disazo compounds as claimed in claim 1 corresponding to the formula (1) in which R1 and R6 each represents hydrogen, chlorine, bromine, nitro, C1 3alkoxy, C1 4 alkyl or alkoxyalkyl of up to four carbon atoms, R2, R3, R4 and R5 each represents hydrogen, alkyl or alkoxy having one to four carbon atoms and Y represents alkyl having one to four carbon atoms, CH3-C6H4-SO2-, C6H5-SO2-, Cl-C6H4-SO2- or CH3-SO2- and the Y-O group is in para-position to the azo bridge.
Claim 2
Dependent Claim
5 words
Disazo compounds of the formula
Claim 3
Dependent Claim
11 words
Disazo compounds as claimed in claim 3 wherein Y is Cl-C6H4-SO2-.
Claim 4
Dependent Claim
12 words
The dyestuff which in its free acid form corresponds to the formula
Claim 5
Dependent Claim
12 words
The dyestuff which in its free acid form corresponds to the formula
Claim 6
Dependent Claim
12 words
The dyestuff which in its free acid form corresponds to the formula
Claim 7
Dependent Claim
12 words
The dyestuff which in its free acid form corresponds to the formula
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |