Process for producing toner for developing electrostatic images and apparatus therefor
US4844349A · kind A · utility
27Cited by
5References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1987 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Oct 15, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B7/0865
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A toner for producing electrostatic latent images is produced by classifying a pulverized feed material into a coarse powder and a fine powder in a first classifying means, pulverizing and recycling the coarse powder to the first classifying means, introducing the fine powder into a multi-division classifying chamber divided into at least three sections where the fine powder is classified into at least a coarse powder fraction, a medium powder fraction and a fine powder fraction. The medium powder fraction is recovered to provide a toner. The coarse powder fraction is recycled to the first classifying means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.