US2835619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating cast iron
Assignee: Huntington Alloys Corp
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Filing: 1954-01-08
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Granted: 1958-05-20
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Expires: 1974-01-08
Abstract
No abstract record available.
Inventors
- 👤 Millis Keith Dwight
- 👤 Gagnebin Albert Paul
- 👤 Pilling Norman Boden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:36
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/10; C21; C21D; C21D5/00; C22C33/00; C22C33/08; C22C37/04; C22C38/00; C22C38/02; C22C38/04; C21D2211/00; C21D2211/009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD FOR PRODUCING A FERROUS ALLOY HAVING IMPROVED DUCTILITY IN COMBINATION WITH SUBSTANTIAL STRENGTH PROPERTIES, WHICH COMPRISES SUBJECTING A CASTING MADE OF A FERROUS ALLOY HAVING A MATRIX CONTAINING COMBINED CARBON AND HAVING IRON IN THE ALPHA FORM AND SAID ALLOY CONTAINING CARBON IN EXCESS OF THAT REQUIRED TO FORM SAID MATRIX PREDOMINANTLY IN THE UNCOMBINED FORM AND CONTAINING MAGNESIUM IN AT LEAST A SMALL BUT EFFECTIVE AMOUNT UP TO LESS THAN 0.5% TO CAUSE THE OCCURRENCE OF SAID UNCOMBINED CARBON IN THE FORM OF SPHEROIDAL PARTICLES DISPERSED IN SAID MATRIX, THE BALANCE OF SAID ALLOY BEING A GRAY CAST IRON COMPOSITION, TO A HEAT TREATMENT FOR AT LEAST ABOUT ONE HOUR AT AN ELEVATED TEMPERATURE WITHIN ABOUT 75*F. BELOW THE ALPHA-GAMMA TRANSFORMATION TEMPERATURE FOR SAID ALLOY TO DECOMPOSE SAID COMBINED CARBON AND TO PROVIDE AN INCREASE IN THE DUCTILITY OF SAID ALLOY.
Claim 2
Independent Claim
144 words
A METHOD FOR PRODUCING A FERROUS ALLOY HAVING IMPROVED DUCTILITY IN COMBINATION WITH SUBSTANTIAL STRENGTH PROPERTIES, WHICH COMPRISES SUBJECTING A CASTING MADE OF A FERROUS ALLOY HAVING A MATRIX CONTAINING COMBINED CARBON AND HAVING IRON IN THE ALPHA FORM AND SAID ALLOY CONTAINING CARBON IN EXCESS OF THAT REQUIRED TO FORM SAID MATRIX PREDOMINANTLY IN THE UNCOMBINED FORM AND CONTAINING MAGNESIUM IN AT LEAST A SMALL BUT EFFECTIVE AMOUNT UP TO LESS THAN 0.5% TO CAUSE THE OCCURRENCE OF SAID UNCOMBINED CARBON IN THE FORM OF SPHEROIDAL PARTICLES DISPERSED IN SAID MATRIX, THE BALANCE OF SAID ALLOY BEING A GRAY CAST IRON COMPOSITION, TO A HEAT TREATMENT FOR AT LEAST ABOUT ONE HOUR AT AN ELEVATED TEMPERATURE WITHIN ABOUT 75*F. BELOW THE ALPHA-GAMMA TRANSFORMATION TEMPERATURE FOR SAID ALLOY TO DECOMPOSE SAID COMBINED CARBON AND TO PROVIDE AN INCREASE IN THE DUCTILITY OF SAID ALLOY.
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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |