Patent US4119456A successfully refreshed from Google Patents.
US4119456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength cast heat-resistant alloy
Assignee: Steel Founders Society of America
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Filing: 1977-01-31
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Granted: 1978-10-10
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Expires: 1997-01-31
Abstract
Abstract A high-strength, heat-resistant alloy is provided which comprises, in weight percent, about 0.2 to about 0.75 percent carbon, from about 20.0 to about 30.0 percent chromium, from about 15.0 to about 60.0 percent nickel, up to about 2.0 percent manganese, up to about 2.5 percent silicon, from about 3.0 to about 10.0 tungsten, from about 0.1 to about 1.0 zirconium, with the balance being iron plus incidental impurities.
Inventors
- 👤 Donald Brian Roach
- 👤 John Andrew Van Echo
- 👤 Albert Mangold Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:33
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/053; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A high-strength, heat-resistant castable alloy consisting of about 0.2 to about 0.75 percent carbon, about 20.0 to about 30.0 percent chromium, from about 15.0 to about 60.0 percent nickel, up to about 2.0 percent manganese, up to about 2.5 percent silicon, from about 3.0 to about 10.0 tungsten, from about 0.1 to about 1.0 zirconium, with the balance being iron plus incidental impurities.
Claim 2
Dependent Claim
63 words
A high-strength, heat-resistant castable alloy consisting of about 0.2 to about 0.75 percent carbon, about 20.0 to about 30.0 percent chromium, from about 15.0 to about 60.0 percent nickel, up to about 2.0 percent manganese, up to about 2.5 percent silicon, from about 3.0 to about 10.0 tungsten, from about 0.1 to about 1.0 zirconium, with the balance being iron plus incidental impurities.
Claim 3
Dependent Claim
22 words
The high-strength, heat-resistant alloy of claim 1 wherein carbon is present in an amount ranging from about 0.4 to about 0.60 percent.
Claim 4
Dependent Claim
23 words
The high-strength, heat resistant alloy of claim 1 wherein chromium is present in an amount ranging from about 24.0 to about 28.0 percent.
Claim 5
Dependent Claim
22 words
The high-strength, heat-resistant alloy of claim 1 wherein nickel is present in an amount ranging from about 33.0 to about 37.0 percent.
Claim 6
Dependent Claim
22 words
The high-strength, heat-resistant alloy of claim 1 wherein tungsten is present in an amount ranging from about 3.0 to about 7.0 percent.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |