Patent US3682900A successfully refreshed from Google Patents.
US3682900A
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Stilbene derivatives
Assignee: Novartis AG
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Filing: 1969-04-21
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Granted: 1972-08-08
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Expires: 1989-04-21
Abstract
Abstract NEW STILBENE DERIVATIVES OF THE FORMULA 2-((4-Y-PHENYL)-CH=CH-(1,4-PHENYLENE)-),5-(X-C6H4-) BENZOXAZOLE IN WHICH X REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SULPHONIC ACID GROUP, A WATER-SOLUBLE SALT OF THE SULPHONIC ACID GROUP AND A SULPHONAMIDE GROUP, AND Y REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A CARBOXYLIC ACID GROUP AND A WATER-SOLUBLE SALT OF THE CARBOXYLIC ACID GROUP. THE COMPOUNDS OF THE PRESENT INVENTION ARE OPTICAL BRIGHTENERS WHICH ARE ESPECIALLY USEFUL IN WASHING AGENTS FOR ORGANIC FIBROUS MATERIALS.
Inventors
- 👤 Peter Liechti
- 👤 Erwin Maeder
- 👤 Leonardo Guglielmetti
- 👤 Adolf Emil Siegrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:09
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/57; D; D06; D06L; D06L4/00; D06L4/60
Claims Analysis
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |