Patent US3905951A successfully refreshed from Google Patents.
US3905951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs containing a 1-lower alkyl-6-hydroxypyrid-2-one coupling component
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1969-06-23
•
Granted: 1975-09-16
•
Expires: 1989-06-23
Abstract
Abstract Water-insoluble monoazo dyestuffs of the formula: WHEREIN A is an optionally substituted aryl radical, n is 0 or 1, Z is an optionally substituted alkyl or aryl radical, one of X1 and X2 is hydrogen, optionally substituted alkyl or aryl or CN, -COR, -COOR or -CONR1R2 and the other is -CN, -COOR -COR or CONR1R2, R being optionally substituted alkyl or aryl and R1 and R2 being independently hydrogen or optionally substituted alkyl or aryl. The use of the said dyestuffs for colouring synthetic textile materials.
Inventors
- 👤 Alistair Howard Berrie
- 👤 Nigel Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80; C07D213/81; C07D213/82; C07D213/84; C07D213/85; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B29/3626; C09B29/363
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
WATER-INSOULABLE MONOAZO DYESTUFF FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS HAVING THE GENERAL FORMULA,
Claim 2
Dependent Claim
15 words
WATER-INSOULABLE MONOAZO DYESTUFF FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS HAVING THE GENERAL FORMULA,
Claim 3
Dependent Claim
15 words
Water-insoluble monoazo dyestuff free from sulphonic acid and carboxylic acid groups having the general formula
Claim 4
Dependent Claim
15 words
Water-insoluble monoazo dyestuff free from sulphonic acid and carboxylic acid groups having the general formula
Claim 5
Dependent Claim
14 words
A virtually water-insoluble azo compound free from sulfonic acid groups and having the formula
Claim 6
Dependent Claim
14 words
A virtually water-insoluble azo compound free from sulfonic acid groups and having the formula
Claim 7
Dependent Claim
5 words
A compound of the formula
Claim 8
Dependent Claim
5 words
A compound of the formula
Claim 9
Dependent Claim
10 words
The water-insoluble monoazo dyestuff of claim 1 having the formula
Claim 10
Dependent Claim
10 words
The water-insoluble monoazo dyestuff of claim 1 having the formula
Claim 11
Dependent Claim
10 words
The water-insoluble monoazo dyestuff of claim 1 having the formula
References Cited (Backward Citations)
US2431190A
Cited
US3487066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |