Electrophotographic developer containing positively chargeable toner
US4837100A · kind A · utility
10Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Sep 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/097
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positively chargeable electrophotographic developer is disclosed, comprising a carrier, toner particles positively chargeable by friction with the carrier, fine particles of hydrophilic alumina, and fine particles of one of tin oxide, hydrophobic silica and titanium dioxide. The developer hardly undergoes toner cloud or toner dropping during development and suffers neither extreme deterioration in charging properties nor fog formation even when used for taking a large number of copies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.