US3210183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing nodular graphite-cast steel and-cast iron having excellent castability
Assignee: RES INST IRON STEEL
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Filing: 1962-01-15
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Granted: 1965-10-05
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Expires: 1982-01-15
Abstract
No abstract record available.
Inventors
- 👤 Ototani Tohei
- 👤 Maruyama Masuteru
- 👤 Matsumoto Jiro
- 👤 Izumi Sumio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:05
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD OF MANUFACTURING NODULAR GRAPHITE-CAST STEEL AND -CAST IRON CONSISTING ESSENTIALLY OF 1.0 TO 4.5% OF CARBON AND THE BALANCE ESSENTIALLY IRON AND HAVING AN EXCELLENT CASTABILITY, WHICH COMPRISES A FIRST STEP OF ADDING 0.5 TO 4% OF CARBON TO THE RAW IRON MATERIAL CONTAINING LESS THAN 4% OF THE TOTAL AMOUNT OF CARBON, WHILE MELTING TO EFFECT STRON DEOXIDATION AND DESULFURIZATION OF MOLTEN METAL SUCH THAT THE OXYGEN AND SULFUR CONTENTS OF SAID MOLTEN METAL BECOME LESS THAN 0.0030% AND 0.020%, RESPECTIVELY, AND A SECOND STEP OF ADDING 0.2 TO 7% OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND SILICON ALLOYS CONTAINING LESS THAN 0.15% OF NON-METALLIC INCLUSIONS.
Claim 2
Independent Claim
113 words
A METHOD OF MANUFACTURING NODULAR GRAPHITE-CAST STEEL AND -CAST IRON CONSISTING ESSENTIALLY OF 1.0 TO 4.5% OF CARBON AND THE BALANCE ESSENTIALLY IRON AND HAVING AN EXCELLENT CASTABILITY, WHICH COMPRISES A FIRST STEP OF ADDING 0.5 TO 4% OF CARBON TO THE RAW IRON MATERIAL CONTAINING LESS THAN 4% OF THE TOTAL AMOUNT OF CARBON, WHILE MELTING TO EFFECT STRON DEOXIDATION AND DESULFURIZATION OF MOLTEN METAL SUCH THAT THE OXYGEN AND SULFUR CONTENTS OF SAID MOLTEN METAL BECOME LESS THAN 0.0030% AND 0.020%, RESPECTIVELY, AND A SECOND STEP OF ADDING 0.2 TO 7% OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND SILICON ALLOYS CONTAINING LESS THAN 0.15% OF NON-METALLIC INCLUSIONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |