Patent US2456897A successfully refreshed from Google Patents.
US2456897A
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Electrolytic clarification apparatus
Assignee: Individual
•
Filing: 1942-05-19
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Granted: 1948-12-21
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Expires: 1962-05-19
Abstract
No abstract record available.
Inventors
- 👤 Smiley Lloyd Dunn
- 👤 Edward S Lansing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US671946A
Cited
US1194000A
Cited
US791457A
Cited
US799605A
Cited
US1516112A
Cited
US2299964A
Cited
US2242139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |