US3767390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Martensitic stainless steel for high temperature applications
Assignee: Sunbeam Oster Co Inc
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Filing: 1972-02-01
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Granted: 1973-10-23
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Expires: 1992-02-01
Abstract
Abstract A martensitic stainless steel for high temperature applications consisting essentially of about .15 to .35 percent carbon, up to 1 percent manganese, up to 1 percent silicon, 11 to 13 percent chromium, .25 to 1.25 percent nickel, .50 to 1.50 percent molybdenum, .50 to 1.50 percent tungsten, .10 to .50 percent vanadium, .05 to .50 percent niobium and the balance substantially all iron, characterized in having good impact strength, a lack of any substantial delta ferrite and high creep rupture life in excess of about 40,000 pounds per square inch at 100,000 hours and 1000*F.
Inventors
- 👤 R Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/48; C22C38/44; C22C38/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The martensitic stainless steel of claim 1 containing about 0.3 percent niobium.
Claim 2
Dependent Claim
15 words
The martensitic stainless steel of claim 1 containing less than 0.010 percent by weight sulfur.
Claim 3
Dependent Claim
42 words
The martensitic stainless steel of claim 1 containing about 0.23 percent carbon, 0.75 percent manganese, 0.35 percent silicon, 12 percent chromium, 0.80 percent nickel, 1.0 percent molybdenUm, 1.0 percent tungsten, 0.25 percent vanadium, 0.29 percent niobium and the remainder substantially all iron.
References Cited (Backward Citations)
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US2147123A
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US2793113A
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US2801916A
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US2968549A
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US3139337A
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |