US3904642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzimidazolyl coumarine fluorescent dyes
Assignee: BASF SE
•
Filing: 1972-09-05
•
Granted: 1975-09-09
•
Expires: 1992-09-05
Abstract
Abstract Dyes of the formula: OBTAINED FROM THE CORRESPONDING 2-IMINOCOUMARINES BY REACTION WITH A COMPOUND OF THE FORMULA: The dyes give brilliant yellow to red shades on textile material, particularly polyesters and acrylonitrile polymers.
Inventors
- 👤 Wolfgang Mach
- 👤 Horst Scheuermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
C; C09; C09B; C09B57/00; C09B23/00; C09B23/0008; C09B23/005; C09B23/0058; C09B57/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
6 words
A FLUORESCENT DYE OF THE FORMULA
Claim 2
Dependent Claim
6 words
A FLUORESCENT DYE OF THE FORMULA
Claim 3
Dependent Claim
27 words
The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is cyano; A is hydrogen; and n is zero.
Claim 4
Dependent Claim
33 words
The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is cyano; A is methyl; n is 1; and X is the anion CH3SO4 .
Claim 5
Dependent Claim
27 words
The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is -CO2CH3; A is hydrogen; and n is zero.
Claim 6
Dependent Claim
23 words
The dye of the formula as claimed in claim 1 wherein R1 and R2 each is alkyl of 1 to 4 carbon atoms.
Claim 7
Dependent Claim
19 words
The dye of the formula as claimed in claim 1 wherein R1 and R2 each is methyl or ethyl.
Claim 8
Dependent Claim
14 words
The dye of the formula as claimed in claim 1 wherein n is zero.
Claim 9
Dependent Claim
14 words
The dye of the formula as claimed in claim 1 wherein Y is cyano.
Claim 10
Dependent Claim
14 words
The dye of the formula as claimed in claim 1 wherein Y is carbamoyl.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |