US3755352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-(4{40 -methoxysulphonyl-phenyl)-3-(4{41 -chlorophenyl)-pyrazoline
Assignee: Novartis Corp
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Filing: 1971-11-30
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Granted: 1973-08-28
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Expires: 1991-11-30
Abstract
Abstract Novel 1-(4''-methoxysulphonyl-phenyl)-3-(4''''chlorophenyl)pyrazoline is described which has unexpectedly a very good affinity to cellulose ester fibers and optically brighten these fibers in pure white, free from undesirable greenish or greenish-blue hues even when applied in higher concentrations; compositions containing this novel compound as well as other substances, especially detergents, are also described; and a process for optically brightening cellulose ester and particularly cellulose acetate fibers is also disclosed.
Inventors
- 👤 S Rosenberger
- 👤 E Troxler
- 👤 H Hausermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C07; C07D; C07D231/00; C07D231/02; C07D231/06; C07D231/54; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |