US3639419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arylpyrazoline sulphonic acid esters
Assignee: Novartis Corp
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Filing: 1967-12-18
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Granted: 1972-02-01
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Expires: 1987-12-18
Abstract
Abstract DI- AND TRI-ARYLPYRAZOLINE SULPHONIC ACID ESTERS ARE DESCRIBED WHICH HAVE UNEXPECTEDLY A VERY GOOD AFFINITY TO CELLULOSE ESTER FIBERS AND OPTICALLY BRIGHTEN THESE FIBERS IN PURE WHITE, FREE FROM UNDESIRABLE GREENISH OR GREENISHBLUE HUES EVEN WHEN APPLIED IN HIGHER CONCENTRATIONS; COMPOSITIONS CONTAINING SUCH NOVEL ESTERS 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
- 👤 Siegfried Rosenberger
- 👤 Eduard Troxler
- 👤 Heinrich Hausermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:11
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
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |