Patents by Inventor Johannes A. H. Van Laarhoven

Johannes A. H. Van Laarhoven 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).

  • Magnetically attractable color toner powder
    Patent number: 4623602
    Abstract: A colored magnetically attractable toner powder in which the individual toner particles comprise a core containing magnetically attractable material, a light-reflecting layer which envelops the core and comprises light-reflecting pigment, yellow-fluorescent dye and a binder in which the dye fluoresces, and a coloring layer which covers the light-reflecting layer and comprises yellow-fluorescent dye, optionally in an admixture with other fluorescent dye or dyes or pigments, and a binder in which the fluorescent dye or dyes fluoresce(s).
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: November 18, 1986
    Assignee: Oce-Nederland B.V.
    Inventors: Martin Bakker, Johannes A. H. Van Laarhoven