Patent US2468022A successfully refreshed from Google Patents.
US2468022A
Expired / Lapsed
US
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Electrolytic apparatus for producing magnesium
Assignee: Dow Chemical Co
•
Filing: 1944-12-21
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Granted: 1949-04-26
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Expires: 1964-12-21
Abstract
No abstract record available.
Inventors
- 👤 Robert D Blue
- 👤 Ralph M Hunter
- 👤 Marshall P Neipert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:02
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US467484A
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US778270A
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US1284403A
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FR505874A
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US1545383A
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US1541947A
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US1466994A
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US1545384A
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US1569606A
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US1755380A
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US1851817A
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US2055359A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |