Patent US4190437A successfully refreshed from Google Patents.
US4190437A
Expired / Lapsed
US
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Low thermal expansion nickel-iron base alloy
Assignee: ALLEGHENY INTERNATIONAL ACCEPTANCE Corp
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Filing: 1979-01-26
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Granted: 1980-02-26
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Expires: 1999-01-26
Abstract
Abstract A castable nickel-iron base alloy suitable for high temperature service and characterized by low thermal expansion and freedom from notch sensitivity and deleterious microshrinkage in castings. The alloy consists essentially of at least 16% nickel, at least 10% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 2% aluminum, 0.06% to 0.25% boron, up to 0.1% carbon, and the balance iron.
Inventors
- 👤 William J. Boesch
- 👤 Gernant E. Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
C; C22; C22C; C22C19/00; C22C38/00; C22C38/10; C22C38/105; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/125; Y10T428/12521
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
An alloy suitable for high temperature service and characterized by low thermal expansion and substantial freedom from notch sensitivity and deleterious microshrinkage, consisting essentially of 30 to 50% nickel, 10 to 20% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 0.1% carbon, up to 2.0% aluminum, 0.06 to 0.3% boron, up to 0.1% zirconium, up to 0.1% rare earth elements, up to 1.0% hafnium, balance essentially iron, the alloy being characterized in containing a eutectic boride.
Claim 2
Dependent Claim
83 words
An alloy suitable for high temperature service and characterized by low thermal expansion and substantial freedom from notch sensitivity and deleterious microshrinkage, consisting essentially of 30 to 50% nickel, 10 to 20% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 0.1% carbon, up to 2.0% aluminum, 0.06 to 0.3% boron, up to 0.1% zirconium, up to 0.1% rare earth elements, up to 1.0% hafnium, balance essentially iron, the alloy being characterized in containing a eutectic boride.
Claim 3
Dependent Claim
12 words
An alloy according to claim 1, having from 2 to 4% columbium.
Claim 4
Dependent Claim
12 words
An alloy according to claim 1, having from 1 to 2% titanium.
Claim 5
Dependent Claim
12 words
An alloy according to claim 1, having from 0.25 to 1% aluminum.
Claim 6
Dependent Claim
21 words
An alloy according to claim 1, having from 2 to 4% columbium, 1 to 2% titanium and 0.25 to 1% aluminum.
Claim 7
Dependent Claim
11 words
An alloy according to claim 1, having up to 1% tantalum.
Claim 8
Dependent Claim
12 words
An alloy according to claim 1, having from 0.15 to 0.045% carbon.
Claim 9
Dependent Claim
106 words
An alloy suitable for high temperature service and characterized by low thermal expansion and substantial freedom from notch sensitivity and deleterious microshrinkage, consisting essentially of 30 to 50% nickel, 10 to 20% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 0.1% carbon, up to 2.0% aluminum, 0.06 to 0.3% boron, up to 0.1% zirconium, up to 0.1% rare earth elements, up to 1.0% hafnium, up to 0.1% of elements from the group consisting of magnesium, calcium, strontium and barium, up to 3% molybdenum, up to 3% tungsten, balance essentially iron, the alloy being characterized in containing a eutectic boride.
Claim 10
Dependent Claim
106 words
An alloy suitable for high temperature service and characterized by low thermal expansion and substantial freedom from notch sensitivity and deleterious microshrinkage, consisting essentially of 30 to 50% nickel, 10 to 20% cobalt, up to 5% columbium, up to 3% tantalum, up to 2.5% titanium, up to 0.1% carbon, up to 2.0% aluminum, 0.06 to 0.3% boron, up to 0.1% zirconium, up to 0.1% rare earth elements, up to 1.0% hafnium, up to 0.1% of elements from the group consisting of magnesium, calcium, strontium and barium, up to 3% molybdenum, up to 3% tungsten, balance essentially iron, the alloy being characterized in containing a eutectic boride.
Claim 11
Dependent Claim
12 words
An alloy according to claim 8, having from 2 to 4% columbium.
Claim 12
Dependent Claim
12 words
An alloy according to claim 8, having from 1 to 2% titanium.
Claim 13
Dependent Claim
12 words
An alloy according to claim 8, having from 0.25 to 1% aluminum.
Claim 14
Dependent Claim
21 words
An alloy according to claim 8, having from 2 to 4% columbium, 1 to 2% titanium and 0.25 to 1% aluminum.
Claim 15
Dependent Claim
11 words
An alloy according to claim 8, having up to 1% tantalum.
Claim 16
Dependent Claim
12 words
An alloy according to claim 8, having from 0.015 to 0.045% carbon.
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |