US2424797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of cellulosic material
Assignee: Niagara Alkali Co
•
Filing: 1943-12-18
•
Granted: 1947-07-29
•
Expires: 1963-12-18
Abstract
No abstract record available.
Inventors
- 👤 Casciani Ferri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2001268A
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US2083280A
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US2140863A
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US2049676A
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US2098111A
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US2127765A
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US2203205A
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US2228127A
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US2203212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |