Patent US2415439A successfully refreshed from Google Patents.
US2415439A
Expired / Lapsed
US
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Purification of liquids by lignin
Assignee: Individual
•
Filing: 1942-01-19
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Granted: 1947-02-11
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Expires: 1962-01-19
Abstract
No abstract record available.
Inventors
- 👤 Nelson Wyly Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:46
CPC Classifications
C; C13; C13B; C13B20/00; C13B20/12; C13B20/126; C02; C02F; C02F1/00; C02F1/52; C02F1/5263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1314203A
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US1133049A
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US1176999A
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US1556039A
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US1615091A
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US1839061A
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US2221683A
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US2280600A
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US2261917A
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US2200784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |