Composite magnetic developer
US4287282A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1980 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Jan 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0906
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a composite magnetic developer which consists essentially of a homogeneous intimate mixture comprising a plurality of electrically insulating magnetic particulate developers comprising a binder medium and a finely divided magnetic material dispersed in the binder medium, in which the difference of the dielectric constant between the developers is in the range of from 0.2 to 0.85. This composite magnetic developer can provide a clear transferred image having a high density on a transfer sheet such as plain paper, and even if the copying operation is conducted continuously for a long time by using this developer, excellent transferred images can be obtained without substantial change of the composition of the composite developer or substantial reduction of the image density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.