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US400664A
Expired / Lapsed
US
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Process of reducing aluminium from its fluoride salts by electrolysis
Assignee: Individual
•
Filing: 1886-07-09
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Granted: 1889-04-02
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Expires: 1906-07-09
Abstract
No abstract record available.
Inventors
- 👤 M Hall Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1892-04-01 | 1892-10-01 | 1893-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1896-04-01 | 1896-10-01 | 1897-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1900-04-02 | 1900-10-02 | 1901-04-03 | $7700.00 | Window Closed / Lapsed |