Patent US3200802A successfully refreshed from Google Patents.
Patent US3728107A successfully refreshed from Google Patents.
US3728107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additives for production of cast irons
Assignee: Standard Oil Co
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Filing: 1972-01-03
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Granted: 1973-04-17
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Expires: 1992-01-03
Abstract
Abstract THE ADDITION OF SILICON VARBIDE PELLETED WITH CHROMITE TO MOLTEN IRON HAS BEEN FOUND TO HOMOGENIZE THE MICROSTRUCTURE TO CONTROL THE HARDNESS. AN ADDITION IN THE RANGE OF 0.10 T 1.0% SILICON CARBIDE PELLETED WITH CHROMITE INCREASES THE HARDNESS OF A CASTING. CATALYTICALLY ACTIVATED SILICON CARBIDE IN THE RANGE OF FROM 0.1 TO 1.5% BY WEIGHT HAS ALSO BEEN FOUND TO REDUCE THE HARDNESS OF AN IRON ALLOY. THE ADDITIONS ARE PREFERABLY MADE IN THE MOLTEN STAGE IMMEDIATELY SUBSEQUENT TO THE EXIT FROM THE FURNACE OR CUPOLA WHEN CASTING THE METAL IN THE PAN OR FORECRUCIBLE.
Inventors
- 👤 D Loricchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:12
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/006
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |