US2662820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing cast iron
Assignee: Dayton Malleable Iron Co
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Filing: 1950-06-30
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Granted: 1953-12-15
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Expires: 1970-06-30
Abstract
No abstract record available.
Inventors
- 👤 Lester C Crome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:56
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING FROM CASTINGS OF THE CHARACTER DESCRIBED IN WHICH GRAPHITIC CARBON FORMED DURING THE CASTING AND COOLING THEREOF IS SUBSTANTIALLY ENTIRELY PRESENT IN SPHERICAL OR NODULAR FORM WITHOUT SUBSEQUENT ANNEALING AND WHICH ARE SUBSTANTIALLY FREE OF FLAKE-LIKE GRAPHITIC CARBON, WHICH PROCESS COMPRISES THE STEPS OF PREPARING A MOLTEN GRAY IRON MIX, ADDING TO SAID MIX BEFORE POURING A LIMITED MODIFYING AMOUNT OF APPROXIMATELY 1.5% CALCIUM SILICIDE AS A NODULAR GRAPHITE FORMING AGENT, 2% CALCIUM FLUORIDE AS A FLUXING AGENT, IN COMBINATION WITH APPROXIMATELY 0.5% ZIRCONIUM FOR EXTENDING THE DURATION OF THE NODULAR FORMING EFFECT OF SAID CALCIUM SILICIDE, AND POURING SAID MOLTEN MIX INTO A MOLD FOR PRODUCING SAID IRON CASTING.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING FROM CASTINGS OF THE CHARACTER DESCRIBED IN WHICH GRAPHITIC CARBON FORMED DURING THE CASTING AND COOLING THEREOF IS SUBSTANTIALLY ENTIRELY PRESENT IN SPHERICAL OR NODULAR FORM WITHOUT SUBSEQUENT ANNEALING AND WHICH ARE SUBSTANTIALLY FREE OF FLAKE-LIKE GRAPHITIC CARBON, WHICH PROCESS COMPRISES THE STEPS OF PREPARING A MOLTEN GRAY IRON MIX, ADDING TO SAID MIX BEFORE POURING A LIMITED MODIFYING AMOUNT OF APPROXIMATELY 1.5% CALCIUM SILICIDE AS A NODULAR GRAPHITE FORMING AGENT, 2% CALCIUM FLUORIDE AS A FLUXING AGENT, IN COMBINATION WITH APPROXIMATELY 0.5% ZIRCONIUM FOR EXTENDING THE DURATION OF THE NODULAR FORMING EFFECT OF SAID CALCIUM SILICIDE, AND POURING SAID MOLTEN MIX INTO A MOLD FOR PRODUCING SAID IRON CASTING.
References Cited (Backward Citations)
US2527037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |