Patent US2171587A successfully refreshed from Google Patents.
US716977A
Expired / Lapsed
US
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Process of purifying aluminium.
Assignee: JOHN A GILLIAM
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Filing: 1901-07-27
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Granted: 1902-12-30
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Expires: 1921-07-27
Abstract
No abstract record available.
Inventors
- 👤 Edward Lacey Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C11; C11D; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/22
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) | 1905-12-29 | 1906-06-30 | 1906-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1909-12-29 | 1910-06-30 | 1910-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1913-12-29 | 1914-06-30 | 1914-12-30 | $7700.00 | Window Closed / Lapsed |