US3835126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styryl-pyrazoline compounds
Assignee: Hoechst AG
•
Filing: 1971-08-03
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Granted: 1974-09-10
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Expires: 1991-08-03
Abstract
Abstract 1,5-Diaryl-3-styryl pyrazolines, which are obtained by condensation of a distyryl ketone and an aliphatic 4-hydrazinophenyl sulfone, are useful as optical brighteners, especially in admixture with known 1,3-diaryl pyrazoline brighteners.
Inventors
- 👤 H Mengler
- 👤 G Rosch
- 👤 E Schinzel
- 👤 O Smerz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:50
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
The compound as claimed in claim 1, wherein R and R'' are p-chlorophenyl and X is -CH2-CH2-SO3Na.
Claim 2
Dependent Claim
17 words
The compound as claimed in claim 1, wherein R and R'' are phenyl and X is -CH2-CH2-SO3Na.
Claim 3
Dependent Claim
17 words
The compound as claimed in claim 1, wherein R and R'' are p-chlorophenyl and X is -CH2-CH2-OH.
Claim 4
Dependent Claim
17 words
The compound as claimed in claim 1, wherein R and R'' are p-chlorophenyl and X is vinyl.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |