Magnetic particle powder included in magnetic toners for magnetic image character recognition
US5389482A · kind A · utility
19Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/112
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A specific magnetic particle powder is described, which is included in magnetic toners used for magnetic image character recognition (MICR). The magnetic particle powder is a magnetite particle and distinguished by the facts that its residual magnetization is of 12 to 20 emu/g, its Fe.sup.2+ content is of 18.5 to 22.5% by weight, its surface is deposited with Si or Al oxide or mixture thereof and its specific surface area is of 3.5 to 9.5 m.sup.2 /g. The magnetic particle powder used as one component of the magnetic toner enables the formation of fine accurate images and the exact detection of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.