Patent US2646375A successfully refreshed from Google Patents.
US2646375A
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US
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Process for hardening alloy gray cast iron
Assignee: Huntington Alloys Corp
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Filing: 1950-11-20
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Granted: 1953-07-21
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Expires: 1970-11-20
Abstract
No abstract record available.
Inventors
- 👤 Sefing Frederick George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:22
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/10; C21; C21D; C21D5/00; C22C33/00; C22C33/08; C22C37/06; C22C37/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE PROCESS FOR PRODUCING A HARDENED ALLOY CAST IRON CASTING WHICH COMPRISES HEATING WITHIN THE RANGE OF ABOUT 1600* F. TO ABOUT 1800* F. A CASTING COMPRISED OF AN ALLOY GRAY CAST IRON CONTAINING ABOUT 2.25% TO ABOUT 3.25% TOTAL CARBON, ABOUT 7% TO 9% NICKEL, ABOUT 3% TO ABOUT 4.5% COPPER, THE SUM OF THE NICKEL AND COPPER CONTENTS BEING ABOUT 10% TO 12%, ABOUT 1% TO 4% CHROMIUM, ABOUT 1.5% TO 3% SILICON, ABOUT 0.3% TO 1% MANGANESE AND THE BALANCE ESSENTIALLY IRON, AND THEREAFTER SLOWLY COOLING SAID CASTING FROM WITHIN SAID TEMPERATURE RANGE TO BELOW ABOUT 900* F. AT AN AVERAGE RATE NOT EXCEEDING ABOUT 50* F. PER HOUR TO IMPART TO SAID CASTING A HARDNESS OF AT LEAST ABOUT 450 BRINELL.
Claim 2
Dependent Claim
125 words
THE PROCESS FOR PRODUCING A HARDENED ALLOY CAST IRON CASTING WHICH COMPRISES HEATING WITHIN THE RANGE OF ABOUT 1600* F. TO ABOUT 1800* F. A CASTING COMPRISED OF AN ALLOY GRAY CAST IRON CONTAINING ABOUT 2.25% TO ABOUT 3.25% TOTAL CARBON, ABOUT 7% TO 9% NICKEL, ABOUT 3% TO ABOUT 4.5% COPPER, THE SUM OF THE NICKEL AND COPPER CONTENTS BEING ABOUT 10% TO 12%, ABOUT 1% TO 4% CHROMIUM, ABOUT 1.5% TO 3% SILICON, ABOUT 0.3% TO 1% MANGANESE AND THE BALANCE ESSENTIALLY IRON, AND THEREAFTER SLOWLY COOLING SAID CASTING FROM WITHIN SAID TEMPERATURE RANGE TO BELOW ABOUT 900* F. AT AN AVERAGE RATE NOT EXCEEDING ABOUT 50* F. PER HOUR TO IMPART TO SAID CASTING A HARDNESS OF AT LEAST ABOUT 450 BRINELL.
References Cited (Backward Citations)
US2530545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |