US3177071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of ironsilicon magnesium prealloys
Assignee: Knapsack AG
•
Filing: 1962-09-19
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Granted: 1965-04-06
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Expires: 1982-09-19
Abstract
No abstract record available.
Inventors
- 👤 Ebert Hans
- 👤 Frank Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C21C1/105; C22; C22C; C22C33/00; C22C33/08; C22C33/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR THE MANUFACTURE OF IRON-SILICON-MAGNESIUM PREALLOYS, WHICH COMPRISES PREPARING A LIQUID MAGNESIUM MELT HAVING A TEMPERATURE OF ABOUT 650*C., PROTECTING THE MELT AGAINST AIR OXIDATION, AND SLOWLY ADDING SOLID FERROSILICON CONTAINING AT LEAST 70% BY WEIGHT SILICON TO THE MELT WHILE GRADUALLY INCREASING THE TEMPERATURE THEREOF TO ABOUT 1070* TO 110*C. WITH THE
Claim 2
Dependent Claim
55 words
A PROCESS FOR THE MANUFACTURE OF IRON-SILICON-MAGNESIUM PREALLOYS, WHICH COMPRISES PREPARING A LIQUID MAGNESIUM MELT HAVING A TEMPERATURE OF ABOUT 650*C., PROTECTING THE MELT AGAINST AIR OXIDATION, AND SLOWLY ADDING SOLID FERROSILICON CONTAINING AT LEAST 70% BY WEIGHT SILICON TO THE MELT WHILE GRADUALLY INCREASING THE TEMPERATURE THEREOF TO ABOUT 1070* TO 110*C. WITH THE
References Cited (Backward Citations)
US2762705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |