Toner Concentration Detector for Dry Powder Magnetic Brush Toning System

Author:  Baer,Clark,Schaefer
Source:  US Patent 3,970,036
Doc ID:  1976010
Year of Publication:  1976
Abstract:  
A toner concentration detecting and toner replenishing system for use in an electrostatic copier having a magnetic brush which carries dry developer comprising a mixture of ferromagnetic carrier particles and toner particles into contact with the surface of a photoconductor upon which a latent electrostatic image has been formed, in which system a quantity of developer is removed from the magnetic brush leaves the surface...........