Patent US3759695A successfully refreshed from Google Patents.
US3759695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making ferrosilicon
Assignee: Elkem Metals Co LP
•
Filing: 1967-09-25
•
Granted: 1973-09-18
•
Expires: 1987-09-25
Abstract
Abstract AN ELECTRIC FURNACE SUBMERGED ARC PRCESS FOR MAKING FERROSILICON BY REACTING AGGLOMERATES OF FINELY DIVIDED CARBON, IRON ORE AND SILICA.
Inventors
- 👤 J Downing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:19
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5264; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |