US2530545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardenable cast iron
Assignee: Huntington Alloys Corp
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Filing: 1949-08-06
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Granted: 1950-11-21
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Expires: 1969-08-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Sefing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:33
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06; C22C37/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
AS A NEW ARTICLE OF MANUFACTURE, AN ALLOY GRAY CAST IRON CASTING CONTAINING ABOUT 2.5% TO ABOUT 3% CARBON, ABOUT 7.5% TO ABOUT 9% NICKEL, ABOUT 3.5% TO ABOUT 4% COPPER, ABOUT 2% TO ABOUT 2.5% CHROMIUM, ABOUT 1.75% TO ABOUT 2.25% SILICON, UP TO ABOUT 0.8% MANGANESE AND THE BALANCE ESSENTIALLY IRON, SAID CASTING BEING CHARACTERIZED BY A LOW MACHINABLE HARDNESS AT LEAST AFTER A HEATING TO A TEMPERATURE OF ABOUT 1600*F. TO ABOUT 1800*F., FOLLOWED BY A RAPID COOLING TO A TEMPERATURE BELOW ABOUT 900*F., BUT NOT SUBSTANTIALLY BELOW ATMOSPHERIC TEMPERATURE; AND BEING CHARACTERIZED BY A HIGH HARDNESS OF ABOUT 525 BRINELL AFTER A SUBSEQUENT THERMAL TREATMENT AT ABOUT 1000* TO ABOUT 1050* F. FOR ABOUT 8 TO ABOUT 15 HOURS.
References Cited (Backward Citations)
GB279415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |