Patent US2676957A successfully refreshed from Google Patents.
US2676957A
Expired / Lapsed
US
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Deaminated trisazo dye
Assignee: GAF Chemicals Corp
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Filing: 1951-12-22
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Granted: 1954-04-27
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Expires: 1971-12-22
Abstract
No abstract record available.
Inventors
- 👤 William H Armento
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
THE DYESTUFF OF THE FORMULA:
References Cited (Backward Citations)
US399581A
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US515381A
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US515897A
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US516381A
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US603646A
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US2174998A
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US2155001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |