Patents Assigned to The Pilot Inc Co., Ltd.
  • Rubber-erasable aqueous ink for writing material composition and writing materials using the same
    Patent number: 6498203
    Abstract: A rubber-erasable aqueous ink for a writing material composition contains water, a water-soluble polar solvent, and a particulate adhesive colored resin. The particulate adhesive colored resin contains a pigment and an adhesive resin which is adhesive on at least a part of a surface thereof. The particulate adhesive colored resin has a particle diameter distribution such that the amount of particles having a particle diameter of from 2 &mgr;m to 20 &mgr;m is not less than 70% by weight of all the particles.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: December 24, 2002
    Assignee: The Pilot Inc Co., Ltd.
    Inventors: Tsutomu Kito, Hiroyuki Hayashi, Hiroyuki Nakamura