US3293246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble cationic quinophthalone dyestuffs and process for preparing them
Assignee: Hoechst AG
•
Filing: 1963-04-01
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Granted: 1966-12-20
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Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Fuchs Otto
- 👤 Ische Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:39
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/001; C09B25/00; C09B44/00; C09B44/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE WATER-SOLUBLE CATIONIC QUINOPHTAHALONE DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
12 words
THE PROCESS FOR PREPARING THE WATER-SOLUBLE CATIONIC QUINOPHTHALONE DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
US2795582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |