US3823169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary anthraquinone dyestuffs
Assignee: Novartis AG
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Filing: 1971-04-12
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Granted: 1974-07-09
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Expires: 1991-04-12
Abstract
Abstract A CATIONIC ANTHRAQUINONE DYESTUFF, THE CATIONIC PORTION OF WHICH IS FREE OF GROUPS THAT DISSOCIATE ACIDLY IN WATER AND CORRESPONDS TO THE FORMULA (1-(R1-CH(-R2)-NH-),4-(X1-N(+)(-X2)(-X3)-Q-NH-)-ANTHRA QUINONE) Y(-) WHEREIN R1 AND R2 EACH REPRESENT A LOWER ALKYL GROUP, Q REPRESENTS A LOWER ALKYLENE GROUP, X1 AND X2 EACH DENOTES AN OPTIONALLY SUBSTITUTED LOWER ALKYL GROUP, OR X1 AND X2 TOGETHER WITH THE NITROGEN ATOM THAT UNITES THEM AND, OPTIONALLY WITH INCLUSION OF A FURTHER HETERO ATOM, REPRESENT A HETEROCYCLIC RADICAL, X3 REPRESENTS AN OPTIONALLY SUBSTITUTED ALKYL, CYCLOALKYL OR ARYLALKYL RADICAL, AND Y REPRESENT THE ANION EQUIVALENT OF AN INORGANIC OR ORGANIC ACID.
Inventors
- 👤 A Staub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:17
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/207; C09B1/26; C09B1/28; C09B1/285; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/922; 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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |