Patents by Inventor Keisuke Igawa

Keisuke Igawa 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).

  • Mixed yarn
    Patent number: 3939636
    Abstract: A mixed yarn having a uniform dyeability to an acid dye, which comprises at least two kinds of polyamide filaments differing in shrinkage, each consisting mainly of repeating units represented by the following general formula: ##SPC1##
    Type: Grant
    Filed: July 24, 1974
    Date of Patent: February 24, 1976
    Assignee: Toray Industries, Inc.
    Inventors: Yuzaburo Nakayama, Akinori Yamamoto, Tomohiko Asahara, Masaharu Shimamura, Yoshizo Tsuda, Keisuke Igawa, Mitsuhiro Okamoto