Patent US2742459A successfully refreshed from Google Patents.
US2742459A
Expired / Lapsed
US
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Mono-azo-dyestuffs insoluble in water
Assignee: Hoechst AG
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Filing: 1952-08-05
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Granted: 1956-04-17
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Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Fischer Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:13
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/10; C09B29/18; C09B29/20; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE MONO-AZO DYESTUFFS INSOLUBLE IN WATER CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
12 words
THE MONO-AZO DYESTUFFS INSOLUBLE IN WATER CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |