Patent US2753260A successfully refreshed from Google Patents.
US2753260A
Expired / Lapsed
US
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High silicon-carbon tool steel
Assignee: Crucible Steel Company of America
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Filing: 1952-12-16
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Granted: 1956-07-03
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Expires: 1972-12-16
Abstract
No abstract record available.
Inventors
- 👤 Payson Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
AN ALLOY STEEL CONSISTING ESSENTIALLY OF ABOUT: 1.6 TO 1.9% SILICON, 0.9 TO 1.2% CHROMIUM, 1 TO 1.1% CARBON, 0.25 TO 0.5% MANGANESE, UNDER 0.3% OF OTHER ELEMENTS, BALANCE IRON, CHARACTERIZED IN BEING RELATIVELY SHALLOW HARDENING AND IN BEING HARDENABLE TO A MINIMUM OF ABOUT ROCKWELL "C" 60, AND IN MAINTAINING SUCH HARDNESS AFTER TEMPERING FOR ABOUT TWO HOURS AT 700* F.
Claim 2
Dependent Claim
62 words
AN ALLOY STEEL CONSISTING ESSENTIALLY OF ABOUT: 1.6 TO 1.9% SILICON, 0.9 TO 1.2% CHROMIUM, 1 TO 1.1% CARBON, 0.25 TO 0.5% MANGANESE, UNDER 0.3% OF OTHER ELEMENTS, BALANCE IRON, CHARACTERIZED IN BEING RELATIVELY SHALLOW HARDENING AND IN BEING HARDENABLE TO A MINIMUM OF ABOUT ROCKWELL "C" 60, AND IN MAINTAINING SUCH HARDNESS AFTER TEMPERING FOR ABOUT TWO HOURS AT 700* F.
References Cited (Backward Citations)
US2004331A
Cited
US2519627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |