Patent US3837845A successfully refreshed from Google Patents.
US3837845A
Expired / Lapsed
US
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Oxide coated ferrous metal powder
Assignee: Huntington Alloys Corp
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Filing: 1972-03-27
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Granted: 1974-09-24
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Expires: 1992-03-27
Abstract
Abstract Steel powder forged at a temperature at which the steel is characterized by a microstructure containing specified percentages of ferrite and austenite contributes to low flow stress and other indicated advantages.
Inventors
- 👤 N Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:46
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/17; C22C33/0235; C22C33/0278; C22C33/0285; B22F2998/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
Steel powder in accordance with claim 1 in which the oxygen content does not exceed about 0.15 percent, the particle size is less than 275 microns, the oxide file is not greater than about 5 microns, manganese, if any, is not greater than 0.4 percent, the powder also being virtually columbium free.
Claim 2
Dependent Claim
30 words
Steel powder in accordance with claim 2 containing copper in an amount sufficient to impart significant hardening and strength upon being cooled from an aging treatment of 900*F. - 1000*F.
Claim 3
Dependent Claim
29 words
Steel powder in accordance with claim 3 which contains at least 1 percent copper, at least 0.01 percent columbium and in which the molybdenum does not exceed 1.2 percent.
Claim 4
Dependent Claim
32 words
Steel powder in accordance with claim 2 containing from 0.8 to 1.5 percent silicon, up to 0.4 percent manganese, about 0.5 to 1.2 percent nickel and about 0.2 to 0.5 percent molybdenum.
Claim 5
Dependent Claim
16 words
Steel powder in accordance with claim 5 which contains from about 1 to 2 percent copper.
Claim 6
Dependent Claim
33 words
Steel powder in accordance with claim 1 containing from 2 to 2.5 percent silicon, about 2 to 3 percent nickel, about 0.8 to 1.2 percent molybdenum and about 1 to 2 percent copper.
Claim 7
Dependent Claim
16 words
A wrought or cast alloy steel having a chemical composition as set forth in claim 1.
Claim 8
Dependent Claim
91 words
Steel powder particularly adapted for use in powder forging and formed of a composition consisting of up to 0.4 percent carbon, about 0.8 to 2.5 percent silicon, up to less than 0.4 percent manganese, about 0.5 to 4 percent nickel, about 0.2 to 2 percent molybdenum, up to 0.2 percent columbium, up to 2 percent copper, oxygen present in an amount not greater than 1 percent, up to 3 percent each of cobalt, chromium, tungsten, vanadium, up to 0.5 percent in total of aluminum plus titanium, and the balance essentially iron.
Claim 9
Dependent Claim
15 words
A powder forged connecting rod formed of a composition as set forth in claim 1.
Claim 10
Dependent Claim
14 words
A powder forged gear formed of a composition as set forth in claim 9.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |