Patent US3756869A successfully refreshed from Google Patents.
US3756869A
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US
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Method of hardening steel plates
Assignee: Bethlehem Steel Corp
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Filing: 1970-09-03
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Granted: 1973-09-04
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Expires: 1990-09-03
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF HARDENING STEEL, AND MORE SPECIFICALLY TO A METHOD OF HARDENING QUENCH HARDENABLE STEEL PLATES AS THEY ARE BEING MOVED THROUGH A QUENCH ZONE. THE IMPROVED QUENCH IS CHARACTERIZED BY A NEW COMBINATION OF THE RATE OF WATER APPLICATION, WATER PRESSURE, THE ANGLE OF WATER IMPINGEMENT UPON THE SURFACE OF THE PLATE, AND THE AREA OF DIRECT IMPINGEMENT, ALL IN A PARTICULAR RELATIONSHIP. THE QUENCH WATER DIRECTLY IMPINGES BOTH SIDES OF A PLATE BEING HARDENED, THROUGHOUT THE COMPLETE AREA OF THE QUENCH ZONE SO AS TO COOL THE STEEL AT THE MAXIMUM POSSIBLE RATE AND MINIMIZE THE FORMATION OF HIGH TEMPERATURE TRANSFORMATION PRODUCTS.
Inventors
- 👤 G Melloy
- 👤 J Hlinka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:06
CPC Classifications
B; B05; B05B; B05B1/00; B05B1/14; B05B1/20; B05B1/26; B05B1/262; B05B1/267; C; C21; C21D; C21D1/00; C21D1/62; C21D1/667
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |