Patent US3778256A successfully refreshed from Google Patents.
US3778256A
Expired / Lapsed
US
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Heat-resistant alloy for a combustion liner of a gas turbine
Assignee: Hitachi Ltd
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Filing: 1971-12-28
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Granted: 1973-12-11
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Expires: 1991-12-28
Abstract
Abstract An alloy for a combustion liner of a gas turbine, characterized by comprising 0.03 to 0.10 weight percent of carbon, 0.3 to 1.0 weight percent of silicon, 0.50 to 3.00 weight percent of manganese, 43.0 to 50.0 weight percent of nickel, 22.0 to 30.0 weight percent of chromium, 0.10 to 0.50 weight percent of titanium, at least one of 0.005 to 0.20 weight percent of elements of cerium group in rare earth elements and 0.20 to 0.90 weight percent of niobium, and the balance iron and impurities accompanying thereto.
Inventors
- 👤 R Sasaki
- 👤 T Kashimura
- 👤 H Hataya
- 👤 Y Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:28
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
14 words
An alloy according to claim 1, wherein said alloy has been subject to forging.
Claim 2
Dependent Claim
22 words
An alloy in accordance with claim 2, wherein the niobium is present in an amount of from 0.40 to 0.70 weight percent.
Claim 3
Dependent Claim
16 words
An alloy in accordance with claim 2 which contains less than 0.010 weight percent of oxygen.
Claim 4
Dependent Claim
22 words
An alloy in accordance with claim 1, whereiN the niobium is present in an amount of from 0.40 to 0.70 weight percent.
Claim 5
Dependent Claim
16 words
An alloy in accordance with claim 1 which contains less than 0.010 weight percent of oxygen.
Claim 6
Dependent Claim
92 words
An alloy consisting essentially of 0.03 to 0.10 weight per cent of carbon, 0.30 to 1.00 weight per cent of silicon, 0.50 to 3.00 weight per cent of manganese, 43.0 to 50.0 weight percent of nickel, 22.0 to 30.0 weight per cent of chromium, 0.10 to 0.50 weight per cent of titanium, 0.20 to 0.90 weight per cent of niobium, 0.005 to 0.20 weight per cent of at least one element selected from a cerium group in rare earth metals, and the balance iron and impurities accompanying therewith and possessing high ductility.
Claim 7
Dependent Claim
35 words
An alloy in accordance with claim 7 which contains 0.20 to 0.90 weight percent of niobium, and 0.005 to 0.20 weight percent of at least one element selected from cerium group in rare earth metals.
Claim 8
Dependent Claim
16 words
An alloy in accordance with claim 8 which contains less than 0.010 weight percent of oxygen.
Claim 9
Dependent Claim
35 words
An alloy in accordance with claim 7 which contains 0.40 to 0.70 weight percent of niobium, and 0.03 to 0.17 weight percent of at least one element selected from cerium group in rare earth metals.
Claim 10
Dependent Claim
16 words
An alloy in accordance with claim 10 which contains less than 0.010 weight percent of oxygen.
Claim 11
Dependent Claim
27 words
An alloy in accordance with claim 7, wherein the element of the cerium group is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium and samarium.
Claim 12
Dependent Claim
20 words
An alloy in accordance with claim 7, wherein the cerium group elements are a mixture of lanthanum, cerium and neodymium.
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |