US3655366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low alloy structural steel
Assignee: Huntington Alloys Corp
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Filing: 1969-10-13
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Granted: 1972-04-11
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Expires: 1989-10-13
Abstract
Abstract Low cost, precipitation hardenable, structural steels containing carbon, nickel, molybdenum and columbium, the steels being capable of developing high strength and both ambient and low temperature toughness. Other constituents can be present, notably copper, manganese, silicon, etc.
Inventors
- 👤 Robert Allen De Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:23
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A steel in accordance with claim 1 containing from 0.8% to 1.2% molybdenum.
Claim 2
Dependent Claim
17 words
A steel in accordance with claim 1 in which chromium, if any, does not exceed 0.25 percent.
Claim 3
Dependent Claim
22 words
A steel in accordance with claim 1 which in a section size of 3 inches or more contains at least 0.5% copper.
Claim 4
Dependent Claim
13 words
A steel in accordance with claim 1 containing from 0.2% to 0.7% manganese.
Claim 5
Dependent Claim
140 words
An alloy steel possessing a yield strength of at least about 150,000 psi, an impact toughness of at least 50 ft.-lbs. in the longitudinal direction and at least 25 ft.-lbs. in the transverse direction at temperatures down to at least -40* F., and good weldability and formability, said steel consisting of from about 0.06% to about 0.13% carbon, about 5% to 8% nickel, from about 0.8% to about 1.2% molybdenum, metal from the group consisting of columbium and vanadium in an amount from about 0.05% to about 0.11 the sum of the carbon plus columbium not exceeding about 0.23%, Up to about 1.75% copper, up to about 0.8% manganese, up to 0.5% silicon, up to 0.25% chromium, the chromium not exceeding about 0.2% when the carbon content is 0.12% or more, up to 0.15% aluminum and the balance essentially iron.
References Cited (Backward Citations)
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |