Patent US2783225A successfully refreshed from Google Patents.
US2783225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo-dyestuffs insoluble in water
Assignee: Hoechst AG
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Filing: 1953-10-27
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Granted: 1957-02-26
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Expires: 1973-10-27
Abstract
No abstract record available.
Inventors
- 👤 Langbein Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
THE WATER-INSOLUBLE AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
9 words
THE WATER-INSOLUBLE AZO-DYESTUFFS 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) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |