US3131097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of bearing steel to eliminate retained austenite
Assignee: Motors Liquidation Co
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Filing: 1962-02-23
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Granted: 1964-04-28
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Expires: 1982-02-23
Abstract
No abstract record available.
Inventors
- 👤 Edward R Mantel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:38
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/18; F; F16; F16C; F16C2204/00; F16C2204/60; F16C2204/66; F16C33/00; F16C33/30; F16C33/58; F16C33/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR HARDENING A BEARING STEEL HAVING A COMPOSITION OF ABOUT 0.95% TO 1.10% CARBON, 1.30% TO 1.60% CHROMIUM, 0.25% TO 0.45% MANGANESE, 0.25% TO 0.45% SILICON AND THE BALANCE IRON, THE STEPS COMPRISING AUSTENITIZING THE METAL AT A TEMPERATURE OF 1750*F. TO 1825*F. AND QUENCHING THE METAL IN A LIQUID QUENCHING MEDIUM AT APPROXIMATELY ROOM TEMPERATURE, REASUSTENITIZING THE METAL AT 1550*F. TO 1600*F. AND QUENCHING THE METAL IN A LIQUID QUENCHING MEDIUM AT APPROXIMATELY ROOM TEMPERATURE, IMMEDIATELY REFRIGERATIANG THE METAL AT SUBZERO TEMPERATURES TO CONVERT A MAJOR PROPORTION OF THE REMAINING AUJSTENITE TO MARTENSITE AND FINALLY TEMPERING THE METAL AT A TEMPERATURE F 400*F. TO 500*F. TO CONVERT THE REMAINING AUSTENITE TO MARTENSITE.
Claim 2
Dependent Claim
115 words
A PROCESS FOR HARDENING A BEARING STEEL HAVING A COMPOSITION OF ABOUT 0.95% TO 1.10% CARBON, 1.30% TO 1.60% CHROMIUM, 0.25% TO 0.45% MANGANESE, 0.25% TO 0.45% SILICON AND THE BALANCE IRON, THE STEPS COMPRISING AUSTENITIZING THE METAL AT A TEMPERATURE OF 1750*F. TO 1825*F. AND QUENCHING THE METAL IN A LIQUID QUENCHING MEDIUM AT APPROXIMATELY ROOM TEMPERATURE, REASUSTENITIZING THE METAL AT 1550*F. TO 1600*F. AND QUENCHING THE METAL IN A LIQUID QUENCHING MEDIUM AT APPROXIMATELY ROOM TEMPERATURE, IMMEDIATELY REFRIGERATIANG THE METAL AT SUBZERO TEMPERATURES TO CONVERT A MAJOR PROPORTION OF THE REMAINING AUJSTENITE TO MARTENSITE AND FINALLY TEMPERING THE METAL AT A TEMPERATURE F 400*F. TO 500*F. TO CONVERT THE REMAINING AUSTENITE TO MARTENSITE.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |