Patents by Inventor Tsunenori Yokoyama

Tsunenori Yokoyama 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).

  • Process for preparing polyester filamentary material
    Patent number: 5087401
    Abstract: A process for preparing polyester continuous filamentary material by (a) extruding the polyester material while molten to form filaments, (b) solidifying the molten filaments by cooling them to a temperature at or below their glass transition point, (c) drawing the solidified filaments within a hot drawing zone, (d) subjecting the drawn filaments to a finishing treatment, (e) advancing the finished filaments around first and second godet rollers and, while the filaments are disposed between the first and second godet rollers, subjecting the filaments to heat treatment by advancing the filaments through a heat treatment zone without contacting the filaments with a solid hot surface, the filaments being advanced through the heat treatment zone under a given tension T, and (f) winding the filaments at a speed of at least 4,500 m/min under a given tension t. the respective tensions T and t lie within the ranges0.5 t.ltoreq.T.ltoreq.0.5-0.5 t (I)0.05.ltoreq.t.ltoreq.0.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: February 11, 1992
    Assignee: Toray Industries, Inc.
    Inventors: Tsunenori Yokoyama, Koji Hashimoto, Koichi Sato