Ferrite carrier for electrophotographic developer and electrophotographic developer
US8026033B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Jul 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed are a ferrite carrier for electrophotographic developer and an electrophotographic developer using the ferrite carrier, wherein: the ferrite carrier is a composite ferrite composed of Li and Mg; when the composition of the ferrite is calculated as a mixture of a Li ferrite having a stoichiometric composition and a Mg ferrite having a stoichiometric composition, the excessive amount of Fe2O3 is less than 5 mol %, or the total excessive amount of Li2O and MgO is less than 1 mol %; the content of the elements other than Li, Mg, Fe and O is 2 % by weight or less; and further, the content of Mn in terms of element is 1000 to 9000 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.