US3904678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brighteners containing sulfonic acid groups of the bis-styrylbenzene series
Assignee: BASF SE
•
Filing: 1970-05-04
•
Granted: 1975-09-09
•
Expires: 1990-05-04
Abstract
Abstract Bis-styrylbenzene compounds having sulfonic acid groups which are useful as optical brighteners, especially for natural and synthetic polyamides and cotton.
Inventors
- 👤 Horst Scheuermann
- 👤 Peter-Matthias Hell
- 👤 Gottfried Burkhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:53
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
6 words
AN OPTICAL BRIGHTENER OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN OPTICAL BRIGHTENER OF THE FORMULA
Claim 3
Dependent Claim
11 words
An optical brightener as claimed in claim 1 of the formula
Claim 4
Dependent Claim
5 words
The compound of the formula
Claim 5
Dependent Claim
5 words
The compound of the formula
Claim 6
Dependent Claim
5 words
The compound of the formula
Claim 7
Dependent Claim
5 words
The compound of the formula
Claim 8
Dependent Claim
5 words
The compound of the formula
Claim 9
Dependent Claim
5 words
The compound of the formula
Claim 10
Dependent Claim
5 words
The compound of the formula
Claim 11
Dependent Claim
5 words
The compound of the formula
References Cited (Backward Citations)
US2527425A
Cited
US2547910A
Cited
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 |