US3574181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo dyes
Assignee: Sandoz AG
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Filing: 1968-01-18
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Granted: 1971-04-06
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Expires: 1988-01-18
Abstract
Abstract DISAZO DYES HAVING THE FORMULA 3,7-BIS(X-N=N-),5,5-DI(O=),DI(HALOGEN-)DIBENZOTHIOPHENE WHERE THE TWO X SYMBOLS STAND FOR THE RADICALS OF IDENTICAL OR DIFFERENT COUPLING COMPONENTS WHICH ARE FREE FROM WATER-SOLUBILIZING GROUPS, ARE USEFUL FOR THE PIGMENTATION OR PRINTING OF NATURAL AND SYNTHETIC MATERIALS.
Inventors
- 👤 Willy Forter
- 👤 Fritz Kehrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:24
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/34
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |