US3154441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat-treating railroad wheels
Assignee: United States Steel Corp
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Filing: 1962-04-20
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Granted: 1964-10-27
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Expires: 1982-04-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Fernand J Dewez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:13
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD OF HEAT-TREATING AFTER HARDENING A STEEL RAILROAD WHEEL HAVING A RIM PORTION AND A PLATE-HUB PORTION, WHICH METHOD COMPRISES THE STEPS OF HEATING THE WHEEL TO A TEMPERATURE BETWEEN 600* F. AND THE LOWER CRITICAL TEMPERATURE OF THE STEEL, DIFFERENTIALLY QUENCHING BOTH THE RIM PORTION AND THE PLATE-HUB PORTION FROM SAID TEMPERATURE, SAID QUENCHING BEING CHARACTERIZED BY THE QUENCH OF THE RIM PORTION COMMENCING AT LEAST AS SOON AS THE QUENCH OF THE PLATE-HUB PORTION, AND THE QUENCE OF THE PLATE-HUB PORTION BEING SUFFICIENTLY RAPID TO BRING THE PLATE-HUB PORTION TO AMBIENT TEMPERATURE BEFORE THE RIM PORTION REACHES AMBIENT TEMPERATURE.
Claim 2
Independent Claim
102 words
A METHOD OF HEAT-TREATING AFTER HARDENING A STEEL RAILROAD WHEEL HAVING A RIM PORTION AND A PLATE-HUB PORTION, WHICH METHOD COMPRISES THE STEPS OF HEATING THE WHEEL TO A TEMPERATURE BETWEEN 600* F. AND THE LOWER CRITICAL TEMPERATURE OF THE STEEL, DIFFERENTIALLY QUENCHING BOTH THE RIM PORTION AND THE PLATE-HUB PORTION FROM SAID TEMPERATURE, SAID QUENCHING BEING CHARACTERIZED BY THE QUENCH OF THE RIM PORTION COMMENCING AT LEAST AS SOON AS THE QUENCH OF THE PLATE-HUB PORTION, AND THE QUENCE OF THE PLATE-HUB PORTION BEING SUFFICIENTLY RAPID TO BRING THE PLATE-HUB PORTION TO AMBIENT TEMPERATURE BEFORE THE RIM PORTION REACHES AMBIENT TEMPERATURE.
References Cited (Backward Citations)
US1740347A
Cited
US2019281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |