US3431103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of ferrosilicon
Assignee: Knapsack AG
•
Filing: 1966-03-02
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Granted: 1969-03-04
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Expires: 1986-03-02
Abstract
No abstract record available.
Inventors
- 👤 Hugo Querengasser
- 👤 Johannes Krause
- 👤 Klaus Frank
- 👤 Johann Cziska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
C; C22; C22C; C22C35/00; C22C35/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |