Patent US2978320A successfully refreshed from Google Patents.
US2978320A
Expired / Lapsed
US
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Method for producing a high strength ferrous metal
Assignee: Motors Liquidation Co
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Filing: 1958-12-29
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Granted: 1961-04-04
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Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 William B Larson
- 👤 Robert F Thomson
- 👤 Fred J Webbere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A METHOD OF PRODUCING A FERROUS METAL CASTING HAVING A HIGH MODULUS OF ELASTICITY, TENSILE STRENGTH AND YIELD STRENGTH IN THE AS-CAST CONDITION, SAID METHOD COMPRISING FORMING A MELT WHICH WOULD SOLIDIFY WITH AN ESSENTIALLY WHITE IRON MICROSTRUCTURE IN THE ABSENCE OF BORON, SAID MELT COMPRISING 1% TO 2.5% CARBON, 1.5% TO 3.2% SILICON, MANGANESE NOT IN EXCESS OF 1.15%, 0.001% TO 0.05% BORON AND THE BALANCE SUBSTANTIALLY ALL IRON, SUPERHEATING SAID MELT TO A TEMPERATURE OF ABOUT 2900*F. TO 3100*F. FOR A PERIOD OF TIME SUFFICIENT TO INSURE THAT CASTINGS PRODUCED THEREFROM HAVE A MICROSTRUCTURE SUBSTANTIALLY FREE OF FLAKE GRAPHITE WITH FREE CARBON PREDOMINANTLY IN THE FORM OF COMPACTED GRAPHITE, AND SUBSEQUENTLY POURING SAID MELT AT A TEMPERATURE OF ABOUT 2600*F. TO 2800*F. INTO A MOLD.
Claim 2
Independent Claim
127 words
A METHOD OF PRODUCING A FERROUS METAL CASTING HAVING A HIGH MODULUS OF ELASTICITY, TENSILE STRENGTH AND YIELD STRENGTH IN THE AS-CAST CONDITION, SAID METHOD COMPRISING FORMING A MELT WHICH WOULD SOLIDIFY WITH AN ESSENTIALLY WHITE IRON MICROSTRUCTURE IN THE ABSENCE OF BORON, SAID MELT COMPRISING 1% TO 2.5% CARBON, 1.5% TO 3.2% SILICON, MANGANESE NOT IN EXCESS OF 1.15%, 0.001% TO 0.05% BORON AND THE BALANCE SUBSTANTIALLY ALL IRON, SUPERHEATING SAID MELT TO A TEMPERATURE OF ABOUT 2900*F. TO 3100*F. FOR A PERIOD OF TIME SUFFICIENT TO INSURE THAT CASTINGS PRODUCED THEREFROM HAVE A MICROSTRUCTURE SUBSTANTIALLY FREE OF FLAKE GRAPHITE WITH FREE CARBON PREDOMINANTLY IN THE FORM OF COMPACTED GRAPHITE, AND SUBSEQUENTLY POURING SAID MELT AT A TEMPERATURE OF ABOUT 2600*F. TO 2800*F. INTO A MOLD.
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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |