Patents by Inventor Masafumi Koishi

Masafumi Koishi 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).

  • Method for treating lithographic printing plates (II)
    Patent number: 4401739
    Abstract: Printing characteristics such as ink receptivity and printing endurance of a lithographic printing plate which utilizes as ink receptive areas the photographically formed silver or silver halide image can be improved by treating said printing plate in the presence of a polymer compound containing in its principal and/or side chain an aromatic nucleus bearing a hydrophilic substituent group, said printing plate containing in at least one of its constitutive layers as hydrophilic high molecular weight-binder.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: August 30, 1983
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Takao Senga, Masafumi Koishi, Yasuo Tsubai