The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1985
Filed:
Feb. 09, 1983
Applicant:
Inventors:
Jan J Bruyndonckx, Hove, BE;
Jacobus H Bosschaerts, Mortsel, BE;
Assignee:
AGFA-Gevaert N. V., Mortsel, BE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355 / ; 118689 ; 118690 ; 324204 ;
Abstract
A xerographic copying apparatus including a device for monitoring the concentration of toner in a xerographic developer mixture of ferromagnetic particles and non-ferromagnetic toner, said device comprising a measuring induction coil that is mounted close to the developer supply so that its magnetic field traverses a portion of the mass of the developer, and a reference induction coil that is mounted close to the measuring coil, but with its magnetic field prevented from traversing the developer mixture, and suitably closely on a wall of the hopper for the toner supply.