Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developer
US10996579B2 · kind B2 · utility
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2References
7Claims
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Key dates
| Filing date | Jan 15, 2018 |
| Grant date | May 4, 2021 |
| Priority date | — |
| Expiry date | Jan 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic core material for electrophotographic developer, satisfying a value of Expression (1): a+b×10+c+d+e+f, being from 200 to 1,400, when an amount of fluorine ion is denoted by a (ppm), an amount of chlorine ion is denoted by b (ppm), an amount of bromide ion is denoted by c (ppm), an amount of nitrite ion is denoted by d (ppm), an amount of nitrate ion is denoted by e (ppm), and an amount of sulfate ion is denoted by f (ppm), which are measured by combustion ion chromatography; and having a pore volume of from 30 to 100 mm3/g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.