US3663314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing steel composition
Assignee: Individual
•
Filing: 1970-10-14
•
Granted: 1972-05-16
•
Expires: 1990-10-14
Abstract
Abstract A bearing steel consisting of 0.55 to 0.78 percent of carbon, 0.50 to 2.00 percent of chromium, 0.10 to 1.15 percent of manganese and 1.00 to 2.00 percent of silicon by weight with the balance iron, said steel having been spheroidized during annealing, and afterward, heated to an austenitizing temperature ranging from about 810* to 870* C. for a period of about 30 minutes to dissolve 0.35 to 0.55 percent by weight of carbon into austenite retaining 3 to 6 percent by weight of undissolved spheroidized iron carbide, liquid quenched and tempered at about 150* C.
Inventors
- 👤 Kaizo Monma
- 👤 Toshiro Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/36; F; F16; F16C; F16C33/00; F16C33/30; F16C33/58; F16C33/62; F16C2204/00; F16C2204/60; F16C2204/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A bearing steel according to claim 1, wherein the carbon is 0.65 to 0.78 percent, and silicon is 1.50 to 1.80 percent by weight.
Claim 2
Dependent Claim
17 words
A bearing steel according to claim 2, wherein the carbon is 0.65 to 0.70 percent by weight.
References Cited (Backward Citations)
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US2753260A
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US2844500A
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US3117863A
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US3155550A
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US3306734A
Cited
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US3595711A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |