US2793947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shelling-resistant rail
Assignee: United States Steel Corp
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Filing: 1954-12-27
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Granted: 1957-05-28
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Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Albert N Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:22
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A RAILROAD RAIL OF FINE-GRAINED ALLOY STEEL CONSISTING ESSENTIALLY OF FROM .55 TO .85% CARBON, FROM 1.1 TO 1.55% MANGANESE, FROM .25 TO .40% SILICON, FROM .85 TO 1.35% CHROMIUM FROM .08 TO .20% VANADIUM AND THE BALANCE SUBSTANTIALLY IRON, SAID RAIL, IN THE HOT-ROLLED CONDITION AFTER COOLING TO ATMOSPHERIC TEMPERATURE FROM THE FINAL ROLLING TEMPERATURE, BEING HIGHLY RESISTANT TO SHELLING UNDER REPEATED HEAVY IMPACT AND EXHIBITING AN AVERAGE BRINELL HARDNESS NUMBER OF FROM 310 TO 360 WITHOUT HEAT TREATMENT.
Claim 2
Dependent Claim
80 words
A RAILROAD RAIL OF FINE-GRAINED ALLOY STEEL CONSISTING ESSENTIALLY OF FROM .55 TO .85% CARBON, FROM 1.1 TO 1.55% MANGANESE, FROM .25 TO .40% SILICON, FROM .85 TO 1.35% CHROMIUM FROM .08 TO .20% VANADIUM AND THE BALANCE SUBSTANTIALLY IRON, SAID RAIL, IN THE HOT-ROLLED CONDITION AFTER COOLING TO ATMOSPHERIC TEMPERATURE FROM THE FINAL ROLLING TEMPERATURE, BEING HIGHLY RESISTANT TO SHELLING UNDER REPEATED HEAVY IMPACT AND EXHIBITING AN AVERAGE BRINELL HARDNESS NUMBER OF FROM 310 TO 360 WITHOUT HEAT TREATMENT.
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) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |