Patent US2984564A successfully refreshed from Google Patents.
US2984564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making pig iron and producing malleable iron
Assignee: National Steel Corp
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Filing: 1958-04-18
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Granted: 1961-05-16
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Expires: 1978-04-18
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Altenburger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:18
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD OF MAKING WHITE IRON IN THE MANUFACTURE OF MALLEABLE IRON WHICH COMPRISES MELTING A CHARGE INCLUDING SCRAP AND PIG IRON CONTAINING ABOUT 1.25 TO 17% BY WEIGHT OF SILICON TO PRODUCE WHITE IRON, AT LEAST A PORTION OF THE PIG IRON ALSO CONTAINING A MINOR AMOUNT
Claim 2
Independent Claim
48 words
THE METHOD OF MAKING WHITE IRON IN THE MANUFACTURE OF MALLEABLE IRON WHICH COMPRISES MELTING A CHARGE INCLUDING SCRAP AND PIG IRON CONTAINING ABOUT 1.25 TO 17% BY WEIGHT OF SILICON TO PRODUCE WHITE IRON, AT LEAST A PORTION OF THE PIG IRON ALSO CONTAINING A MINOR AMOUNT
References Cited (Backward Citations)
US2149480A
Cited
US2280283A
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US2455954A
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US2651570A
Cited
US2661278A
Cited
US2778732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |