Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developer
US10754271B2 · kind B2 · utility
2Cited by
2References
6Claims
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Key dates
| Filing date | Dec 25, 2017 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Dec 25, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1131
- 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 300 to 1,300, 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 BET specific surface area being from 0.06 to 0.25 m2/g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.