US2619439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening rolls
Assignee: United States Steel Corp
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Filing: 1950-06-09
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Granted: 1952-11-25
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Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 James S Rennick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:21
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD OF UNIFORMLY HARDENING THE OUTER SURFACE REGIONS OF STEEL ROLLS, WHICH ARE OF A HYPEREUTECTOID STEEL CAPABLE OF HARDENING WHEN HEATED TO A CRITICAL TEMPERATURE AND QUENCHED AND WHICH INCLUDE A CYLINDRICAL BODY AND HAVE A CENTRAL BORE, COMPRISING SUPPORTING SUCH A ROLL WITHIN A FURNACE, HEATING THE ENTIRE OUTSIDE OF THE ROLL BODY AT ONE TIME WITHIN THE FURNACE WITH THE FURNACE AND THE OUTSIDE OF THE ROLL BODY BEING MAINTAINED AT A TEMPERATURE BETWEEN THE CRITICAL AND 925* C. FOR A MINIMUM PERIOD OF APPROXIMATELY 105 MINUTES, CONTROLLING THE BORE TEMPERATURE SO THAT IT REMAINS CLOSE TO THE CRITICAL BUT AT ALL TIMES BELOW BY IMPINGING STREAMS OF COOLING GAS ON THE BORE SURFACE, AND QUENCHING THE ENTIRE ROLL AT ONE TIME TO PRODUCE ON THE ROLL BODY A HARDENED OUTER LAYER WHICH HAS A HARDNESS OF AT LEAST 40 ROCKWELL C. A UNIFORM DEPTH GREATER THAN 3/8 INCH AND A SUBSTANTIALLY MARTINSTIC STRUCTURE, THE INNER REGIONS OF THE BORE INCLUDING THE BORE SURFACE REMAINING SOFT AND TOUGH TO RESIST MECHANICAL SHOCK.
Claim 2
Independent Claim
176 words
A METHOD OF UNIFORMLY HARDENING THE OUTER SURFACE REGIONS OF STEEL ROLLS, WHICH ARE OF A HYPEREUTECTOID STEEL CAPABLE OF HARDENING WHEN HEATED TO A CRITICAL TEMPERATURE AND QUENCHED AND WHICH INCLUDE A CYLINDRICAL BODY AND HAVE A CENTRAL BORE, COMPRISING SUPPORTING SUCH A ROLL WITHIN A FURNACE, HEATING THE ENTIRE OUTSIDE OF THE ROLL BODY AT ONE TIME WITHIN THE FURNACE WITH THE FURNACE AND THE OUTSIDE OF THE ROLL BODY BEING MAINTAINED AT A TEMPERATURE BETWEEN THE CRITICAL AND 925* C. FOR A MINIMUM PERIOD OF APPROXIMATELY 105 MINUTES, CONTROLLING THE BORE TEMPERATURE SO THAT IT REMAINS CLOSE TO THE CRITICAL BUT AT ALL TIMES BELOW BY IMPINGING STREAMS OF COOLING GAS ON THE BORE SURFACE, AND QUENCHING THE ENTIRE ROLL AT ONE TIME TO PRODUCE ON THE ROLL BODY A HARDENED OUTER LAYER WHICH HAS A HARDNESS OF AT LEAST 40 ROCKWELL C. A UNIFORM DEPTH GREATER THAN 3/8 INCH AND A SUBSTANTIALLY MARTINSTIC STRUCTURE, THE INNER REGIONS OF THE BORE INCLUDING THE BORE SURFACE REMAINING SOFT AND TOUGH TO RESIST MECHANICAL SHOCK.
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) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |