Patent US2953378A successfully refreshed from Google Patents.
Patent US3124492A successfully refreshed from Google Patents.
US3124492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat-treating rails
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
•
Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:12
CPC Classifications
E; E01; E01B; E01B31/00; E01B31/02; E01B31/18; C; C21; C21D; C21D9/00; C21D9/04; C21D9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD OF HEAT TREATING A RAILROAD RAIL HAVING A HEAD, WEB AND FLANGE WHICH COMPRISES BENDING THE RAIL IN THE PLANE OF THE WEB THEREOF, WITHIN THE ELASTIC LIMIT, SO THAT THE HEAD IS CONVEX AND THE FLANGE CONCAVE, CONTINUOUSLY HEATING TO HEAD OF THE RAIL PROGRESSIVELY FROM ONE END THEREOF TO THE OTHER, ABOVE THE AUSTENITIZATION TEMPERATURE WHILE HOLDING THE RAIL IN ITS CURVED CONDITION, INTIALLY QUENCHING THE SURFACE OF THE HEAD PROGRESSIVELY A PREDETERMINED TIME AFTER THE HEATING, THEN, AT A PREDETERMINED TIME AFTER SELF TEMPERING OF THE QUENCHED SURFACE HAS OCCURRED BY ABSORPTION OF HEAT FROM THE INTERIOR OF THE HEAD, FINALLY QUENCHING THE HEAD THROUGHOUT SUBSTANTIALLY TO AMBIENT TEMPERATURE AND THEN RELEASING THE RAIL FROM BENDING STRESS THEREBY PERMITTING IT TO RESUME ITS NORMAL SUBSTANTIALLY STRAIGHT CONDITION.
Claim 2
Independent Claim
132 words
A METHOD OF HEAT TREATING A RAILROAD RAIL HAVING A HEAD, WEB AND FLANGE WHICH COMPRISES BENDING THE RAIL IN THE PLANE OF THE WEB THEREOF, WITHIN THE ELASTIC LIMIT, SO THAT THE HEAD IS CONVEX AND THE FLANGE CONCAVE, CONTINUOUSLY HEATING TO HEAD OF THE RAIL PROGRESSIVELY FROM ONE END THEREOF TO THE OTHER, ABOVE THE AUSTENITIZATION TEMPERATURE WHILE HOLDING THE RAIL IN ITS CURVED CONDITION, INTIALLY QUENCHING THE SURFACE OF THE HEAD PROGRESSIVELY A PREDETERMINED TIME AFTER THE HEATING, THEN, AT A PREDETERMINED TIME AFTER SELF TEMPERING OF THE QUENCHED SURFACE HAS OCCURRED BY ABSORPTION OF HEAT FROM THE INTERIOR OF THE HEAD, FINALLY QUENCHING THE HEAD THROUGHOUT SUBSTANTIALLY TO AMBIENT TEMPERATURE AND THEN RELEASING THE RAIL FROM BENDING STRESS THEREBY PERMITTING IT TO RESUME ITS NORMAL SUBSTANTIALLY STRAIGHT CONDITION.
References Cited (Backward Citations)
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Cited
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Cited
US1929356A
Cited
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Cited
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Cited
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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) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |