US3414442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of alloy cast iron
Assignee: Huntington Alloys Corp
•
Filing: 1966-06-10
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Granted: 1968-12-03
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Expires: 1986-06-10
Abstract
No abstract record available.
Inventors
- 👤 Greenwood Roger Kearsley
- 👤 Westwood Cedric George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:32
CPC Classifications
C; C22; C22C; C22C37/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A HEAT TREATMENT PROCESS FOR IMPROVING HARDNESS, TOUGHNESS, AND IMPACT FATIGUE LIFE OF ALLOYED WHITE CAST IRONS COMPRISING ABOUT 2.8% TO 3.7% CARBON, ABOUT 0.5% TO 3.0% SILICON, ABOUT 0.2% TO 1.5% MANGANESE, ABOUT 4% TO 8% NICKEL, ABOUT 4% TO 15% CHROMIUM, BALANCE IRON WITH RESIDUAL IMPURITIES, WHICH COMPRISES: (A) HEATING THE CAST IRON TO A TEMPERATURE OF ABOUT 450* C. TO ABOUT 800* C. IN ORDER TO TRANSFORM THE RETAINED AUSTENITE PRESENT IN THE AS-CAST CONDITION; (C) SLOWLY COOLING THE CAST IRON TO ABOUT 200* C. AT A RATE NOT EXCEEDING ABOUT 50% C. PER HOUR.
Claim 2
Dependent Claim
98 words
A HEAT TREATMENT PROCESS FOR IMPROVING HARDNESS, TOUGHNESS, AND IMPACT FATIGUE LIFE OF ALLOYED WHITE CAST IRONS COMPRISING ABOUT 2.8% TO 3.7% CARBON, ABOUT 0.5% TO 3.0% SILICON, ABOUT 0.2% TO 1.5% MANGANESE, ABOUT 4% TO 8% NICKEL, ABOUT 4% TO 15% CHROMIUM, BALANCE IRON WITH RESIDUAL IMPURITIES, WHICH COMPRISES: (A) HEATING THE CAST IRON TO A TEMPERATURE OF ABOUT 450* C. TO ABOUT 800* C. IN ORDER TO TRANSFORM THE RETAINED AUSTENITE PRESENT IN THE AS-CAST CONDITION; (C) SLOWLY COOLING THE CAST IRON TO ABOUT 200* C. AT A RATE NOT EXCEEDING ABOUT 50% C. PER HOUR.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |