Patents by Inventor Ryoichi Yamazaki

Ryoichi Yamazaki 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).

  • Hygroscopic polyamide fiber
    Patent number: 5306761
    Abstract: A polyamide fiber comprised of (A) a thermoplastic aliphatic polyamide having copolymerized therein a polyalkylene oxide unit and having a melting point of at least 160.degree. C., and (B) a polyoxyalkylene glycol, wherein the ingredient (B) is finely dispersed in the ingredient (A). A polyamide fiber exhibiting a rate of moisture absorption of at least 3.5%/5 minutes at 25.degree. C. and R.H. 90% and/or a triboelectric voltage of not larger than 1.5 kV at 20.degree. C. and R.H. 40% is obtained by removing the ingredient (B) from the above-mentioned polyamide fiber by means of dissolution.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: April 26, 1994
    Assignee: Teijin Limited
    Inventors: Shinji Ohwaki, Ryoichi Yamazaki, Masato Yoshimoto