US1386227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining crude electric-furnace silicon
Assignee: ELECTRO METALLURG CO
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Filing: 1919-09-26
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Granted: 1921-08-02
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Expires: 1939-09-26
Abstract
No abstract record available.
Inventors
- 👤 Becket Frederick Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/037
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) | 1924-08-01 | 1925-01-31 | 1925-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-01 | 1929-01-31 | 1929-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-01 | 1933-01-31 | 1933-08-02 | $7700.00 | Window Closed / Lapsed |