Two-component, dry electrographic developer compositions containing hard magnetic carrier particles and method for using the same
US4546060A · kind A · utility
138Cited by
12References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Nov 4, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1088
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged, magnetic carrier particles, which (a) comprise a magnetic material exhibiting "hard" magnetic properties, as characterized by a coercivity of at least 300 gauss and (b) exhibit an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 gauss, is disclosed. The developer is employed in combination with a magnetic applicator comprising a rotatable magnetic core and an outer, nonmagnetizable shell to develop electrostatic images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.