Patent US3721587A successfully refreshed from Google Patents.
US3721587A
Expired / Lapsed
US
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Low carbon,niobium and aluminum containing steel sheets and plates and process
Assignee: ALAN WOOD STEEL CO US
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Filing: 1970-12-02
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Granted: 1973-03-20
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Expires: 1990-12-02
Abstract
Abstract AN IMPROVED MILD CARBON STEEL WHICH EXHIBITS AN UNSUAL COMBINATION OF PROPERTIES INCLUDING SATISFACTORY HIGH YIELD STRENGTHS, GOOD TOUGHNESS AND WELDABILITY, AND SUPERIOR COLD FORMABILITY IN THE HOT ROLLED CONDITION. THE STEEL, WHICH IS CHARACTERIZED BY MICROSTRUCTURES WHICH ARE VIRTUALLY FREE OF ELONGATED SILICATE INCLUSIONS, HAS THE FOLLOWING COMPOSING BY WEIGHT: CARBON: 0.02 TO 0.08% MANGANESE: 0.25 TO 0.80% SILICON: 0.05% MAXIMUM NIOBIUM: 0.025 TO 0.010% PREFERABLY 0.025 TO 0.045% ALUMIMUM: 0.005 TO 0.025%, PREFERABLY 0.008 TO 0.018% IRON AND IMPURITIES, BALANCE.
Inventors
- 👤 A Allten
- 👤 F Semel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49991
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |