Developer for electrophotography
US5358819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1993 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Apr 13, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1075
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The object of the invention is to provide a developer for electrophotography which may present stable charging properties and image density after a prolonged period of copying operations as well as have a long life. The object can be achieved by providing a developer for electrophotography, compounded of: a toner component; and a carrier component prepared from a ferrite powder mixture in total of 100 parts, consisting of 10 to 90 parts by weight of a ferrite powder having a specific surface range of 200 to 230 cm.sup.2 /g, and 10 to 90 parts by weight of a ferrite powder having a specific surface range of more than 230 to 300 cm.sup.2 /g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.