Patent US3311469A successfully refreshed from Google Patents.
US3311469A
Expired / Lapsed
US
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Manufacture of nodular iron
Assignee: Union Carbide Corp
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Filing: 1964-04-23
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Granted: 1967-03-28
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Expires: 1984-04-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl R Loper
- 👤 Richard W Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:12
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08; C21C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A PROCESS OF MAKING NODULAR IRON BY BRINGING TOGETHER MAGNESIUM, SILICON AND MOLTEN IRON, THE IMPROVEMENT WHICH COMPRISES PROVIDING IN THE MOLTEN IRON A SILICON CONTENT OF BETWEEN ABOUT 1 TO 5%, A MAGNESIUM ADDITION OF ABOUT 0.02 TO 0.25% AND A BISMUTH ADDITION OF FROM ABOUT 0.010 TO ABOUT 0.050%, SAID BISMUTH ADDITION BEING SUFFICIENT TO PROVIDE A SUBSTANTIAL INCREASE IN THE AMOUNT OF SPHEROIDAL GRAPHITE NODULES IN THE IRON AS COMPARED TO THE SAME IRON WITHOUT A BISMUTH ADDITION.
Claim 2
Dependent Claim
82 words
IN A PROCESS OF MAKING NODULAR IRON BY BRINGING TOGETHER MAGNESIUM, SILICON AND MOLTEN IRON, THE IMPROVEMENT WHICH COMPRISES PROVIDING IN THE MOLTEN IRON A SILICON CONTENT OF BETWEEN ABOUT 1 TO 5%, A MAGNESIUM ADDITION OF ABOUT 0.02 TO 0.25% AND A BISMUTH ADDITION OF FROM ABOUT 0.010 TO ABOUT 0.050%, SAID BISMUTH ADDITION BEING SUFFICIENT TO PROVIDE A SUBSTANTIAL INCREASE IN THE AMOUNT OF SPHEROIDAL GRAPHITE NODULES IN THE IRON AS COMPARED TO THE SAME IRON WITHOUT A BISMUTH ADDITION.
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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |