Patent US3646071A successfully refreshed from Google Patents.
US3646071A
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US
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Anthraquinone compounds
Assignee: Sandoz AG
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Filing: 1969-03-18
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Granted: 1972-02-29
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Expires: 1989-03-18
Abstract
Abstract WATER-SOLUBLE ANATHRAQUINONE DYES WHICH BEAR ONE OR TWO 3,5,5-TRIMETHYLCYCLOHEXYLAMINO GROUPS IN THE 1-AND/ OR 4-POSITIONS AND ONE OF TWO-SO3H GROUPS BOUND EITHER DIRECTLY TO A CARBON ATOM OF AN AROMATIC RING OR INDIRECTLY OVER AN OXYGEN ATOM TO A CARBON ATOM OF AN ALIPHATIC CHAIN.
Inventors
- 👤 Wolfgang Frey
- 👤 Wolfgang Schoenauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:34
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/78; C09B62/80; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/30; C09B1/32; C09B1/34; C09B1/50; C09B1/54; C09B1/542; C09B1/547; C09B1/56; C09B1/58
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |