Patent · US Expired

Electrostatic developing device

US5809383A · kind A · utility

1Cited by

3References

11Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Luc Van Goethem · Sint-Gillis-Waas, BE
Robert Janssens · Geel, BE
William Waterschoot · Belsele, BE
Erik Van Echelpoel · Lier, BE

Key dates

Filing date	Jul 1, 1997
Grant date	Sep 15, 1998
Priority date	—
Expiry date	Jul 1, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG03G15/0822
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An electrostatic developing device comprising feed passages (54, 58) for a two-component developer, a hopper (43) for adding fresh toner to the developer to maintain its concentration at a desired level, and a mixer with a vertical helical mixer screw (63) rotatable in a stationary housing (42) and a sleeve (65) surrounding the screw in the housing, an annular space (69) being left between the sleeve and the housing allowing developer transported upwardly by the mixer screw within the sleeve to return via the annular space to the lower end of the screw and then become circulated upwardly again.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.