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US2961438A
Expired / Lapsed
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Ortho-hydroxy-azo-dyestuffs
Assignee: Hoechst AG
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Filing: 1958-12-29
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Granted: 1960-11-22
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Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Fuchs Otto
- 👤 Deubel Reinhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:42
CPC Classifications
C; C09; C09B; C09B39/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
ORTHO-HYDROXY-AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
7 words
ORTHO-HYDROXY-AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
References Cited (Backward Citations)
US1758313A
Cited
FR46622E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |