Method for reducing impurities in misch metal and alloys
US5972074A · kind A · utility
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11Claims
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Key dates
| Filing date | Jul 8, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jul 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/84
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for reducing Carbon contained in hydrogen storage alloys recovered from negative electrodes of nickel/hydrogen storage alloy secondary batteries of misch metal and alloys thereof as raw materials of hydrogen storage alloys for negative electrodes of nickel/hydrogen secondary batteries by adding titanium or zirconium or oxides of these elements, and melting in an inert gas atmosphere or in vacuum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.