US2878518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ferrosilicon particles
Assignee: Knapsack AG
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Filing: 1956-03-06
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Granted: 1959-03-24
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Expires: 1976-03-06
Abstract
No abstract record available.
Inventors
- 👤 Klee Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE PROCESS OF PREPARING A MATERIAL CONSISTING OF FERROSILICON-CONTAINING PARTICLES MORE THAN ABOUT 85 PERCENT OF WHICH IS OF A ROUNDED TO GLOBULAR FORM AND A SMOOTH AND UNIFORM SURFACE, WHICH COMPRISES ADDING TO A FERROSILICON MELT, CONTAINING ABOUT 10 PERCENT TO ABOUT 25 PERCENT OF SILICON AND MORE THAN 0.5 PERCENT OF ALUMINUM, AT LEAST ONE SUBSTANCE CONTAINING SIO2 SELECTED FROM THE GROUP CONSISTING OF QUARTZITE, QUARTZ PEBBLES, QUARTZ, GRAVEL, QUARTZ SAND AND SILICATES RICH IN SIO2 IN AN AMOUNT SO AS TO DIMINSH THE CONTENT IN ALUMINUM OF THE MELT TO A CONTENT RANGING BETWEEN ABOUT 0.5 PERCENT AND ABOUT 0.08 PERCENT, AND THEN SPRAYING THE MELT SO OBTAINED.
Claim 2
Dependent Claim
111 words
THE PROCESS OF PREPARING A MATERIAL CONSISTING OF FERROSILICON-CONTAINING PARTICLES MORE THAN ABOUT 85 PERCENT OF WHICH IS OF A ROUNDED TO GLOBULAR FORM AND A SMOOTH AND UNIFORM SURFACE, WHICH COMPRISES ADDING TO A FERROSILICON MELT, CONTAINING ABOUT 10 PERCENT TO ABOUT 25 PERCENT OF SILICON AND MORE THAN 0.5 PERCENT OF ALUMINUM, AT LEAST ONE SUBSTANCE CONTAINING SIO2 SELECTED FROM THE GROUP CONSISTING OF QUARTZITE, QUARTZ PEBBLES, QUARTZ, GRAVEL, QUARTZ SAND AND SILICATES RICH IN SIO2 IN AN AMOUNT SO AS TO DIMINSH THE CONTENT IN ALUMINUM OF THE MELT TO A CONTENT RANGING BETWEEN ABOUT 0.5 PERCENT AND ABOUT 0.08 PERCENT, AND THEN SPRAYING THE MELT SO OBTAINED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |