Patent US2841490A successfully refreshed from Google Patents.
US2841490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making improved gray cast iron
Assignee: Huntington Alloys Corp
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Filing: 1953-02-18
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Granted: 1958-07-01
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Expires: 1973-02-18
Abstract
No abstract record available.
Inventors
- 👤 Steven William
- 👤 Lamb Roger Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:01
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
THE METHOD FOR PRODUCING SPHEROIDAL GRAPHITE IN CAST IRON CASTINGS MADE FROM MOLTEN HYPOEUTECTIC AND EUTECTIC GRAY CAST IRON WHICH COMPRISES ESTABLISHING A BATH OF MOLTEN GRAY CAST IRON CONTAINING A SMALL AMOUNT OF MAGNESIUM EFFECTIVE IN THE ABSENCE OF DETRIMENTAL ELEMENTS TO INDUCE THE OCCURRENCE OF SPHEROIDAL GRAPHITE IN CASTINGS MADE FROM THE BATH, SAID IRON CONTAINING A DETRIMENTAL ELEMENT FROM THE GROUP CONSISTING OF INDIUM, THALLIUM, TIN, BISMUTH, ANTIMONY, LEAD AND TITANIUM IN AN AMOUNT SUFFICIENT SUBSTANTIALLY TO SUPPRESS THE EFFECT OF MAGNESIUM IN PRODUCING SPHEROIDAL GRAPHITE IN CASTINGS MADE FROM THE IRON, ADDING TO SAID BAT A SMALL AMOUNT UP TO ABOUT 0.05% OF A RARE EARTH METAL TO COUNTERACT THE SUPPRESSIVE EFFECT OF THE DETRIMENTAL ELEMENTS, INOCULATING THE BATH, AND CASTING METAL FROM THE THUS-TREATED BATH TO PROVIDE GRAY CAST IRON CASTINGS CONTAINING A SUBSTANTIAL PROPORTION OF THE GRAPHITE IN A SPHEROIDAL FORM.
Claim 2
Independent Claim
147 words
THE METHOD FOR PRODUCING SPHEROIDAL GRAPHITE IN CAST IRON CASTINGS MADE FROM MOLTEN HYPOEUTECTIC AND EUTECTIC GRAY CAST IRON WHICH COMPRISES ESTABLISHING A BATH OF MOLTEN GRAY CAST IRON CONTAINING A SMALL AMOUNT OF MAGNESIUM EFFECTIVE IN THE ABSENCE OF DETRIMENTAL ELEMENTS TO INDUCE THE OCCURRENCE OF SPHEROIDAL GRAPHITE IN CASTINGS MADE FROM THE BATH, SAID IRON CONTAINING A DETRIMENTAL ELEMENT FROM THE GROUP CONSISTING OF INDIUM, THALLIUM, TIN, BISMUTH, ANTIMONY, LEAD AND TITANIUM IN AN AMOUNT SUFFICIENT SUBSTANTIALLY TO SUPPRESS THE EFFECT OF MAGNESIUM IN PRODUCING SPHEROIDAL GRAPHITE IN CASTINGS MADE FROM THE IRON, ADDING TO SAID BAT A SMALL AMOUNT UP TO ABOUT 0.05% OF A RARE EARTH METAL TO COUNTERACT THE SUPPRESSIVE EFFECT OF THE DETRIMENTAL ELEMENTS, INOCULATING THE BATH, AND CASTING METAL FROM THE THUS-TREATED BATH TO PROVIDE GRAY CAST IRON CASTINGS CONTAINING A SUBSTANTIAL PROPORTION OF THE GRAPHITE IN A SPHEROIDAL 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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |