Patent US3617862A successfully refreshed from Google Patents.
US3623922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy white cast iron
Assignee: Norcast Inc
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Filing: 1968-05-27
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Granted: 1971-11-30
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Expires: 1988-05-27
Abstract
Abstract A MANGANESE-COPPER MOLYBDENUM ALLOY WHITE CAST IRON HAS A SUBSTANTIALLY UNIFORMLY DISTRIBUTED MARTENSITIC STRUCTURE AND A HIGH AND UNIFORM HARDNESS IN EXCESS OF 500 BRINELL AND A HIGH RESISTANCE TO ABRASION AND IMPACT. A PREFERRED RANGE OF ALLOYING COMPONENTS INCLUDES BETWEEN 2.5 AND 5% MANGANESE, BETWEEN ABOUT 2% AND ABOUT 4% CARBON, UP TO ABOUT 2% SILICON AND AT LEAST ONE OF THE GROUP CONSISTING OF 0 TO 2.5% COPPER AND 0 TO 1% MOLYBDENUM WHEREIN THE TOTAL AMOUNT OF COPPER PLUS MOLYBDENUM IS NOT LESS THAN 0.1%, THE BALANCE BEING ESSENTIALLY IRON AND INCIDENTAL IMPURITIES COMMONLY FOUND IN CAST IRON.
Inventors
- 👤 William M Williams
- 👤 Jean Claude Farge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
C; C22; C22C; C22C37/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |