US3155498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ductile iron and method of making same
Assignee: Bethlehem Steel Corp
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Filing: 1961-12-27
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Granted: 1964-11-03
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Expires: 1981-12-27
Abstract
No abstract record available.
Inventors
- 👤 Henry L Jandras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:28
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04; C21; C21C; C21C1/00; C21C1/10; C22C37/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
A METHOD OF MANUFACTURING A WORKABLE DUCTILE IRON ALLOY HAVING A TOTAL CARBON CONTENT OF FROM ABOUT 1.20% UP TO ABOUT 3.60%, A SILICON CONTENT OF FROM ABOUT 1.00% UP TO ABOUT 2.00%, A SULFUR CONTENT OF 0.035% MAX. AND A CONTENT OF FROM ABOUT 0.005% UP TO ABOUT 2.00% OF A NODULARIZING AGENT,, SAID METHOD COMPRISING: (A) TAPPING FROM A FURNACE INTO A LADLE A MOLTEN IRON ALLOY CONTAINING CARBON, SILICON AND SULFUR, (B) TREATING THE MOLTEN IRON ALLOY IN THE LADLE BY OXYGEN INJECTION FOR A PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE REMOVAL OF ALL THE SILICON, (C) ADDING A DEOXIDIZING AGENT COMPRISING SILICON TO THE MOLTEN IRON ALLOY IN THE LADLE TO PRODUCE A SILICON CONTENT OF ABOUT 0.20% UP TO ABOUT 0.50%, (D) ADDING SILICON AND A NODULARIZING AGENT TO THE MOLTEN IRON ALLOY IN THE LADLE, SAID NODULARIZING AGENT CONSISTING OF AT LEAST ONE OF THE ELEMENTS OF THE GROUP MAGNESIUM, TELLURIUM, CERIUM, CALCIUM, LITHIUM, SODIUM, POTASSIUM, THEREBY IMPARTING TO THE SAID MOLTEN IRON ALLOY A FINAL SILICON CONTENT OF FROM ABOUT 1.00% UP TO ABOUT 2.00% ADN 0.005% UP TO ABOUT 2.00% OF SAID NODULARIZING AGENT. (E) TEEMING THE MOLTEN IRON ALLOY INTO A CHILL MOLD AND ALLOWING THE SAID MOLTEN IRON ALLOY TO SOLIDIFY.
Claim 2
Independent Claim
212 words
A METHOD OF MANUFACTURING A WORKABLE DUCTILE IRON ALLOY HAVING A TOTAL CARBON CONTENT OF FROM ABOUT 1.20% UP TO ABOUT 3.60%, A SILICON CONTENT OF FROM ABOUT 1.00% UP TO ABOUT 2.00%, A SULFUR CONTENT OF 0.035% MAX. AND A CONTENT OF FROM ABOUT 0.005% UP TO ABOUT 2.00% OF A NODULARIZING AGENT,, SAID METHOD COMPRISING: (A) TAPPING FROM A FURNACE INTO A LADLE A MOLTEN IRON ALLOY CONTAINING CARBON, SILICON AND SULFUR, (B) TREATING THE MOLTEN IRON ALLOY IN THE LADLE BY OXYGEN INJECTION FOR A PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE REMOVAL OF ALL THE SILICON, (C) ADDING A DEOXIDIZING AGENT COMPRISING SILICON TO THE MOLTEN IRON ALLOY IN THE LADLE TO PRODUCE A SILICON CONTENT OF ABOUT 0.20% UP TO ABOUT 0.50%, (D) ADDING SILICON AND A NODULARIZING AGENT TO THE MOLTEN IRON ALLOY IN THE LADLE, SAID NODULARIZING AGENT CONSISTING OF AT LEAST ONE OF THE ELEMENTS OF THE GROUP MAGNESIUM, TELLURIUM, CERIUM, CALCIUM, LITHIUM, SODIUM, POTASSIUM, THEREBY IMPARTING TO THE SAID MOLTEN IRON ALLOY A FINAL SILICON CONTENT OF FROM ABOUT 1.00% UP TO ABOUT 2.00% ADN 0.005% UP TO ABOUT 2.00% OF SAID NODULARIZING AGENT. (E) TEEMING THE MOLTEN IRON ALLOY INTO A CHILL MOLD AND ALLOWING THE SAID MOLTEN IRON ALLOY TO SOLIDIFY.
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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |