Toner and two-component developer
US-2024337960-A1 · Oct 10, 2024 · US
Ferrite particles and electrophotographic development carrier using same, electrophotographic developer and method of manufacturing ferrite particles
US9507285B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9507285-B2 |
| Application number | US-201414773973-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 26, 2014 |
| Priority date | Mar 28, 2013 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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- Title
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Abstract
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There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 μm, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.
First claim
Opening claim text (preview).
The invention claimed is: 1. Ferrite particles in which Mn ferrite is used as a main phase and which contain Sr ferrite, wherein a degree of projections and recesses in a surface of the particles falls within a range of 2.5 to 4.5 μm, and a standard deviation of a size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. 2. An electrophotographic development carrier, wherein the surface of the ferrite particles of claim 1 is coated with a resin. 3. An electrophotographic developer comprising: the electrophotographic development carrier of claim 2 ; and a toner.
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Classifications
Magnetic properties · CPC title
containing silicon atoms · CPC title
Micrometer sized, i.e. from 1-100 micrometer · CPC title
containing manganese · CPC title
- G03G9/107Primary
having magnetic components · CPC title
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- What does patent US9507285B2 cover?
- There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 μm, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. In this way, a coating resin is left o…
- Who is the assignee on this patent?
- Dowa Electronics Materials Co Ltd, Dowa Ip Creation Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G03G9/107. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 29 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).