Patent US2538263A successfully refreshed from Google Patents.
US2538263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing ductile cast iron
Assignee: Union Carbide Corp
•
Filing: 1949-04-07
•
Granted: 1951-01-16
•
Expires: 1969-04-07
Abstract
No abstract record available.
Inventors
- 👤 Charles M Offenhauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:35
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A METHOD OF PRODUCING DUCTILE CAST IRON THE IMPROVEMENT WHICH COMPRISES PREPARING BATH OF MOLTEN CAST IRON WITHIN THE TEMPERATURE RANGE OF ABOUT 1400 TO 1550* C.; PREPARING A MECHANICAL MIXTURE OF COMMINUTED ZIRCONIUMBEARING MATERIAL AND COMMINUTED ELEMENTAL MAGNESIUM; INTRODUCING INTO SAID MOLTEN BATH OF CAST IRON SAID MECHANICAL MIXTURE OF COMMINUTED ZIRCONIUM-BEARING MATERIAL AND COMMINUTED ELEMENTAL MAGNESIUM IN AN AMOUNT SUFFICIENT TO INCORPORATE IN SAID CAST IRON A RESIDUAL ZIRCONIUM CONTENT OF BETWEEN 3.03% TO 0.5% AND A RESIDUAL MAGNESIUM CONTENT BETWEEN 0.01% AND 0.2%; THEREAFTER INTRODUCING AN INNOCULANT TO SAID CAST IRON IN AN AMOUNT SUFFICIENT TO GRAPHITIZE THE PRIMARY IRON CARBIDE IN SAID CAST IRON; HOLDING SAID MOLTEN CAST IRON UNTIL THE BATH BECOMES SUBSTANTIALLY QUIESCENT AND THEREAFTER CASTING SAID MOLTEN IRON.
Claim 2
Dependent Claim
126 words
IN A METHOD OF PRODUCING DUCTILE CAST IRON THE IMPROVEMENT WHICH COMPRISES PREPARING BATH OF MOLTEN CAST IRON WITHIN THE TEMPERATURE RANGE OF ABOUT 1400 TO 1550* C.; PREPARING A MECHANICAL MIXTURE OF COMMINUTED ZIRCONIUMBEARING MATERIAL AND COMMINUTED ELEMENTAL MAGNESIUM; INTRODUCING INTO SAID MOLTEN BATH OF CAST IRON SAID MECHANICAL MIXTURE OF COMMINUTED ZIRCONIUM-BEARING MATERIAL AND COMMINUTED ELEMENTAL MAGNESIUM IN AN AMOUNT SUFFICIENT TO INCORPORATE IN SAID CAST IRON A RESIDUAL ZIRCONIUM CONTENT OF BETWEEN 3.03% TO 0.5% AND A RESIDUAL MAGNESIUM CONTENT BETWEEN 0.01% AND 0.2%; THEREAFTER INTRODUCING AN INNOCULANT TO SAID CAST IRON IN AN AMOUNT SUFFICIENT TO GRAPHITIZE THE PRIMARY IRON CARBIDE IN SAID CAST IRON; HOLDING SAID MOLTEN CAST IRON UNTIL THE BATH BECOMES SUBSTANTIALLY QUIESCENT AND THEREAFTER CASTING SAID MOLTEN IRON.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |