Patent US2428130A successfully refreshed from Google Patents.
US2428130A
Expired / Lapsed
US
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Tris and polyazo dyes from tetrazotized 0:0' dihydroxybenzidine
Assignee: SWISS FIRM OF SOC OF CHEMICAL
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Filing: 1942-02-26
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Granted: 1947-09-30
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Expires: 1962-02-26
Abstract
No abstract record available.
Inventors
- 👤 Straub Fritz
- 👤 Brassel Jakob
- 👤 Pieth Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:04
CPC Classifications
C; C09; C09B; C09B35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US519523A
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US842548A
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US1210751A
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US1292385A
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US1889732A
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DE577165C
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US2039898A
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US2106876A
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US2189522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |