US2622022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing cast iron
Assignee: Dayton Malleable Iron Co
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Filing: 1948-07-31
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Granted: 1952-12-16
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Expires: 1968-07-31
Abstract
No abstract record available.
Inventors
- 👤 Lester C Crome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:54
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE METHOD OF PRODUCING IRON CASTINGS OF THE CHARACTER DESCRIBED HAVING IN THE AS-CAST STATE AND WITHOUT SUBSEQUENT ANNEALING FREE GRAPHITIC CARBON THEREIN PRESENT IN NODULAR FORM AND WITH SUBSTANTIALLY NO PRECIPITATION OF FLAKELIKE GRAPHITIC CARBON WHICH COMPRISES THE STEPS OF PREPARING A MOLTEN GRAY IRON MIX WHICH ON CASTING GIVES A GRAY CAST IRON AND COMPRISING ABOUT 3.0% TO 4.3% CARBON, ABOUT 2.0% TO 4.0% SILCION AND LESS THAN 0.04% SULPHOR, ADDING TO SAID MIX BEFORE CASTING ABOUT 0.07% TO 0.3% MAGNESIUM AND ABOUT 0.014% TO 0.063% CERIUM EFFECTIVE TO CONTROL PRECIPITATION OF GRAPHITIC CARBON INTO SAID NODULAR FORM DURING GRAPHITE PRECIPITATION IN SAID MIX, AND CASTING SAID MIX WHILE SAID ADDED MAGNESIUM AND CERIUM REMAIN EFFECTIVE THEREIN AS THE SOLE ESSENTIAL ADDED MATERIALS TO CONTROL SAID GRAPHITE PRECIPITATION INTO SAID MODULAR FORM.
Claim 2
Independent Claim
134 words
THE METHOD OF PRODUCING IRON CASTINGS OF THE CHARACTER DESCRIBED HAVING IN THE AS-CAST STATE AND WITHOUT SUBSEQUENT ANNEALING FREE GRAPHITIC CARBON THEREIN PRESENT IN NODULAR FORM AND WITH SUBSTANTIALLY NO PRECIPITATION OF FLAKELIKE GRAPHITIC CARBON WHICH COMPRISES THE STEPS OF PREPARING A MOLTEN GRAY IRON MIX WHICH ON CASTING GIVES A GRAY CAST IRON AND COMPRISING ABOUT 3.0% TO 4.3% CARBON, ABOUT 2.0% TO 4.0% SILCION AND LESS THAN 0.04% SULPHOR, ADDING TO SAID MIX BEFORE CASTING ABOUT 0.07% TO 0.3% MAGNESIUM AND ABOUT 0.014% TO 0.063% CERIUM EFFECTIVE TO CONTROL PRECIPITATION OF GRAPHITIC CARBON INTO SAID NODULAR FORM DURING GRAPHITE PRECIPITATION IN SAID MIX, AND CASTING SAID MIX WHILE SAID ADDED MAGNESIUM AND CERIUM REMAIN EFFECTIVE THEREIN AS THE SOLE ESSENTIAL ADDED MATERIALS TO CONTROL SAID GRAPHITE PRECIPITATION INTO SAID MODULAR FORM.
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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |