Patents by Inventor Tadao Sumiyoshi

Tadao Sumiyoshi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Carrier for electrostatic latent image developing and two-component-type developing agent using the same
    Patent number: 6127079
    Abstract: A two-component-type developing agent comprising a silicone resin-coated carrier and a positively charging toner, the silicone coated carrier having an average particle diameter of from 60 to 110 .mu.m, the silicone resin coating having an average thickness of from 0.1 to 0.3 .mu.m, the carrier having a resistivity of from 1.5.times.10.sup.8 to 1.5.times.10.sup.11 .OMEGA..multidot.cm, the toner concentration being from 3.0 to 5.0 % by weight and the amount of electric charge by friction of the toner based on the suction method being from +10 to +20 .mu.c/g.
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: October 3, 2000
    Assignee: Kyocera Mita Corporation
    Inventors: Tadao Sumiyoshi, Tomohide Iida