High cleanliness spring steel and high cleanliness spring excellent in fatigue properties
US8613809B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | May 23, 2007 |
| Grant date | Dec 24, 2013 |
| Priority date | — |
| Expiry date | Feb 13, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/004
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.