Patent US3290183A successfully refreshed from Google Patents.
US3290183A
Expired / Lapsed
US
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Method of producing anticorrosion high tensile strength rail
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1962-08-21
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Granted: 1966-12-06
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Expires: 1982-08-21
Abstract
No abstract record available.
Inventors
- 👤 Ohtake Tadashi
- 👤 Aoki Koichi
- 👤 Kimura Isao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:00
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/04; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF MANUFACTURING STEEL RAIL WHICH IS HIGH IN TENSILE STRENGTH AND ANTI-CORROSIVENESS WHICH COMLESS THAN 1.0% MOLYBDENUM, LESS THAN 1.0 SILICON, AND LESS THAN 1.5% MENGANESE TO A BLOOMING ROLLING, COOLING PRISES SUBJECTING A STEEL CONTAINING FROM 0.05 TO 0.25% CARBON, FROM 2.0 TO 6.0% CHROMIUM, FROM ABOUT 0.10% TO THE ROLLED STEEL DOWN TO A TEMPERATURE BELOW THE A1 TRANSFORMATION POINT OF THE STEEL, AGAIN HEATING SAID STEEL UP TO A ROLLING TEMPERATURE, AT WHICH TEMPERATURE SAID STEEL IS ROLLED IN RAIL, AND THEN GRADUALLY COOLING SAID RAIL FROM A TEMPERATURE ABOVE 500 TO 700*C. DOWN TO 150*C., OVER A PERIOD IN EXCESS OF 7 HOURS.
Claim 2
Independent Claim
109 words
A METHOD OF MANUFACTURING STEEL RAIL WHICH IS HIGH IN TENSILE STRENGTH AND ANTI-CORROSIVENESS WHICH COMLESS THAN 1.0% MOLYBDENUM, LESS THAN 1.0 SILICON, AND LESS THAN 1.5% MENGANESE TO A BLOOMING ROLLING, COOLING PRISES SUBJECTING A STEEL CONTAINING FROM 0.05 TO 0.25% CARBON, FROM 2.0 TO 6.0% CHROMIUM, FROM ABOUT 0.10% TO THE ROLLED STEEL DOWN TO A TEMPERATURE BELOW THE A1 TRANSFORMATION POINT OF THE STEEL, AGAIN HEATING SAID STEEL UP TO A ROLLING TEMPERATURE, AT WHICH TEMPERATURE SAID STEEL IS ROLLED IN RAIL, AND THEN GRADUALLY COOLING SAID RAIL FROM A TEMPERATURE ABOVE 500 TO 700*C. DOWN TO 150*C., OVER A PERIOD IN EXCESS OF 7 HOURS.
References Cited (Backward Citations)
US1277372A
Cited
US1721555A
Cited
GB324686A
Cited
GB340819A
Cited
US1925029A
Cited
FR797762A
Cited
GB517118A
Cited
GB731684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |