Patent US3257378A successfully refreshed from Google Patents.
US3257378A
Expired / Lapsed
US
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Indazolium azo dyestuffs
Assignee: Kuhlmann SA
•
Filing: 1963-02-12
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Granted: 1966-06-21
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Expires: 1983-02-12
Abstract
No abstract record available.
Inventors
- 👤 Sureau Robert Frederic Michel
- 👤 Mingasson Georges Raymon Henry
- 👤 Kremer Gilbert Victor Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:55
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1211449A
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US2795575A
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US2913303A
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US2893816A
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US3121710A
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US3161631A
Cited
US3148180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |