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Patent US3704230A successfully refreshed from Google Patents.
US3704230A
Expired / Lapsed
US
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Exothermic compositions
Assignee: Standard Oil Co
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Filing: 1971-01-22
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Granted: 1972-11-28
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Expires: 1991-01-22
Abstract
Abstract AN EXOTHERMIC COMPOSITION, USEFUL FOR EXAMPLE, IN CASTING CAST IRON (TO KEEP THE IRON MOLTEN IN THE HEADER OF THE MOLD WHILE THE IRON WITHIN THE MOLD SOLIDIFIES AND CONTRACTS, THEREFORE REQUIRING ADDITIONAL MOLTEN IRON TO FILL UP THE MOLD) COMPRISES SILICON CARBIDE; A SILICON CARBIDE DECOMPOSITION CATALYST (E.G., LEAD OXIDE, POTASSIUM DICHROMATE, OR LEAD CHROMATE); AND OPTIONALLY, SUCH ADDITIONAL INGREDIENTS AS A COMBUSTBLE ORGANIC FILLER, A SILICON CARBIDE DECOMPOSITION RETARDANT (SUCH AS ALUMINA OR SILICA), CALCIUM CHLORIDE, AND FERROSILICON.
Inventors
- 👤 Domingos Loricchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/06; B22D11/00; B22D11/10; B22D11/11; B22D11/111
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |