US3681058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-nickel valve steel
Assignee: Crucible Materials Corp
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Filing: 1969-11-12
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Granted: 1972-08-01
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Expires: 1989-11-12
Abstract
Abstract THIS IS AN AUSTENITIC STAINLESS STEEL, PARTICULARLY SUITED FOR USE IN THE MANUFACTURE OF INTERNAL COMBUSTION ENGINE VALVES CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT, .45 TO .57 CARBON, 7 TO 12 MANAGANESE, .25 MAX. SILICON, 17 TO 22 AND PREFERABLY 18 TO 21.5 CHROMIUM, 1 TO 4 NICKEL, 40 TO .60 NITROGEN, TOTAL ADDITIONAL CARBIDE-FORMING ELEMENT CONTENT OF 1.5 TO 4.5 WITH VANADIUM UP TO .45, AND THE BALANCE IRON. PREFERABLY, SILICON IS .15% MAX. THE STEEL IS CHARACTERIZED BY GOOD ELEVATED-TEMPERATURE STRENGTH AND LEAD-OXIDE CORROSION RESISTANCE.
Inventors
- 👤 Edward J Dulis
- 👤 August Kasak
- 👤 William Stasko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |