US3524842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble cationic phenylazo-naphthol dyestuffs containing a quaternary ammonium group
Assignee: Durand and Huguenin AG
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Filing: 1967-08-04
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Granted: 1970-08-18
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Expires: 1987-08-04
Abstract
No abstract record available.
Inventors
- 👤 Hans Grossmann
- 👤 Heinz Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:45
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/41; A61K8/416; A61K8/49; A61K8/4906; A61K8/4926; A61K8/494; A61Q; A61Q5/00; A61Q5/06; A61Q5/065; C; C09; C09B; C09B44/00; C09B44/02; C09B44/06; D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/30; D06P3/3033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2154838A
Cited
US3148181A
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US3252964A
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US3170910A
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US3454552A
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US3403143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |