Patent US2778732A successfully refreshed from Google Patents.
US2778732A
Expired / Lapsed
US
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Boron-containing ferrosilicon
Assignee: Union Carbide Corp
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Filing: 1954-10-12
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Granted: 1957-01-22
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Expires: 1974-10-12
Abstract
No abstract record available.
Inventors
- 👤 Robert A Aeberly
- 👤 Ralph A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:41
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
THE PROCESS OF PRODUCING MALLEABLE IRON, WHICH COMPRISES ADDING TO A CUPOLA CHARGE OF IRON, SILICON AND MANGANESE, CONTAINING CARBON AND INCIDENTAL IMPURITIES, AN ALLOY CONSISTING OF SILICON IN THE RANGE BETWEEN 15 PERCENT AND 90 PERCENT, BETWEEN 0.01 PERCENT AND 0.20 PERCENT BORON, THE REMAINDER IRON; SAID BORON THUS INTRODUCED COMPRISING BETWEEN 0.0005 PERCENT AND 0.003 PERCENT OF SAID CHARGE, FORMING A CAST IRON ARTICLE AN ANNEALING SAID ARTICLE AT THE ANNEALING TEMPERATURE TO SUBSTANTIALLY CONVERT AND PRECIPITATE IN THE FORM OF TEMPER CARBON THE CARBON PRESENT IN SAID CUPOLA IRON.
Claim 2
Dependent Claim
92 words
THE PROCESS OF PRODUCING MALLEABLE IRON, WHICH COMPRISES ADDING TO A CUPOLA CHARGE OF IRON, SILICON AND MANGANESE, CONTAINING CARBON AND INCIDENTAL IMPURITIES, AN ALLOY CONSISTING OF SILICON IN THE RANGE BETWEEN 15 PERCENT AND 90 PERCENT, BETWEEN 0.01 PERCENT AND 0.20 PERCENT BORON, THE REMAINDER IRON; SAID BORON THUS INTRODUCED COMPRISING BETWEEN 0.0005 PERCENT AND 0.003 PERCENT OF SAID CHARGE, FORMING A CAST IRON ARTICLE AN ANNEALING SAID ARTICLE AT THE ANNEALING TEMPERATURE TO SUBSTANTIALLY CONVERT AND PRECIPITATE IN THE FORM OF TEMPER CARBON THE CARBON PRESENT IN SAID CUPOLA IRON.
Claim 3
Dependent Claim
47 words
AN ALLOY WHICH IN ITS NORMAL USE IS TO BE ADDED TO A CUPOLA CHARGE OF IRON, SILICON CARBON AND MANGANESE IN THE PRODUCTION OF MALLEABLE IRON, WHICH ALLOY CONSISTS OF BETWEEN 15 PERCENT AND 90 PERCENT SILICON, 0.01 PERCENT TO 0.20 PERCENT BORON, THE REMAINDER IRON.
Claim 4
Dependent Claim
47 words
AN ALLOY WHICH IN ITS NORMAL USE IS TO BE ADDED TO A CUPOLA CHARGE OF IRON, SILICON CARBON AND MANGANESE IN THE PRODUCTION OF MALLEABLE IRON, WHICH ALLOY CONSISTS OF BETWEEN 15 PERCENT AND 90 PERCENT SILICON, 0.01 PERCENT TO 0.20 PERCENT BORON, THE REMAINDER IRON.
References Cited (Backward Citations)
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US1509624A
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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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |