US3348981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High tension low temperature tough steel
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1965-02-17
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Granted: 1967-10-24
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Expires: 1985-02-17
Abstract
No abstract record available.
Inventors
- 👤 Goda Susumu
- 👤 Onoue Yasumitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A HIGH TENSILE STRENGHT, LOW TEMPERATURE TOUGH STEEL CONSISTING ESSENTIALLY OF 0.05 TO 0.25% BY WEIGHT OF C, 0.04 TO 0.17% BY WEIGHT OF AL, 0.05 TO 1.60% BY WEIGHT OF MN, 0.20 TO 1.60% BY WEIGHT OF CR, AND 0.05 TO 1.00% BY WEIGHT OF MO, THE COMBINED WEIGHTS OF MN, CR AND MO BEING NO GREATER THAN 2.5% BY WEIGHT, THE REMAINDER BEING FE AND INEVITABLE IMPURITIES AND THE STEEL HAVING THE ALUMINUM IN SOLID SOLUTION THEREIN, THE STEEL HAVING BEEN HEATED TO A TEMPERATURE ABOVE THE A3 POINT TO AUSTENITIZE IT, THEREAFTER HARDENED AT A COOLING RATE OF 10-60* C. PER SEC., AND THEN TEMPERED BY HEATING TO A TEMPERTURE BETWEEN 500*C. AND THE A1 POINT.
Claim 2
Dependent Claim
119 words
A HIGH TENSILE STRENGHT, LOW TEMPERATURE TOUGH STEEL CONSISTING ESSENTIALLY OF 0.05 TO 0.25% BY WEIGHT OF C, 0.04 TO 0.17% BY WEIGHT OF AL, 0.05 TO 1.60% BY WEIGHT OF MN, 0.20 TO 1.60% BY WEIGHT OF CR, AND 0.05 TO 1.00% BY WEIGHT OF MO, THE COMBINED WEIGHTS OF MN, CR AND MO BEING NO GREATER THAN 2.5% BY WEIGHT, THE REMAINDER BEING FE AND INEVITABLE IMPURITIES AND THE STEEL HAVING THE ALUMINUM IN SOLID SOLUTION THEREIN, THE STEEL HAVING BEEN HEATED TO A TEMPERATURE ABOVE THE A3 POINT TO AUSTENITIZE IT, THEREAFTER HARDENED AT A COOLING RATE OF 10-60* C. PER SEC., AND THEN TEMPERED BY HEATING TO A TEMPERTURE BETWEEN 500*C. AND THE A1 POINT.
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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |