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:
Jul. 06, 1993
Filed:
Jan. 02, 1991
Applicant:
Inventors:
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
4301066 ; 430109 ; 430122 ; 430137 ;
Abstract
A two-component dry type developer for developing latent electrostatic images comprises (i) toner particles with an average particle diameter of 14 .mu.m or less and (ii) carrier particles with an average particle diameter of 70 .mu.m or less, with the ratio of the average particle diameter of the toner particles to the average particle diameter of the carrier particles being 1/5 or less, with a dynamic resistance of 1.0.times.10.sup.8 .OMEGA. or less, and the specific triboelectric charge quantity generated between the toner particles and the carrier particles per unit weight of the toner particles is 25 .mu.C/g or more.