US2996376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low alloy steel having high hardness at elevated temperatures
Assignee: Crucible Steel Company of America
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Filing: 1961-04-06
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Granted: 1961-08-15
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Expires: 1981-04-06
Abstract
No abstract record available.
Inventors
- 👤 Alvin E Nehrenberg
- 👤 Thoni V Philip
- 👤 Steven Gary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:35
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A FORGEABLE ALLOY STEEL HARDENABLE BY QUENCHING AND SECONDARY HARDENING AND CAPABLE OF RETAINING A HARDNESS AT ROOM TEMPERATURE OF AT LEAST ROCKWELL "C" 64/66 AFTER 500 HOURS EXPOSURE AT 100* F., AND CONSISTING ESSENTIALLY OF ABOUT: 1 TO 1.25% CARBON, 2 TO 6% CHROMIUM, 1.75 TO 2.25% VANADIUM, 4 TO 7% TUNGSTEN, 3 TO 5% MOLYBDENUM, O TO UNDER 9% COBALT, AND THE BALANCE SUBSTANTIALLY ALL IRON.
Claim 2
Dependent Claim
68 words
A FORGEABLE ALLOY STEEL HARDENABLE BY QUENCHING AND SECONDARY HARDENING AND CAPABLE OF RETAINING A HARDNESS AT ROOM TEMPERATURE OF AT LEAST ROCKWELL "C" 64/66 AFTER 500 HOURS EXPOSURE AT 100* F., AND CONSISTING ESSENTIALLY OF ABOUT: 1 TO 1.25% CARBON, 2 TO 6% CHROMIUM, 1.75 TO 2.25% VANADIUM, 4 TO 7% TUNGSTEN, 3 TO 5% MOLYBDENUM, O TO UNDER 9% COBALT, AND THE BALANCE SUBSTANTIALLY ALL IRON.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |