Patents by Inventor Hasegawa Katsumi

Hasegawa Katsumi 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).

  • Apparatus for melt-spinning thermoplastic polymer fibers
    Patent number: 4780073
    Abstract: A thermoplastic polymer is melt-spun into a spinning tube decompressed to not more than 0.7 atm and withdrawn therefrom to the outer air through a narrow groove provided in a bottom sealing body which substantially seals the interior of the spinning tube from the outer air. The bottom sealing body is provided with a plurality of regulating chambers communicating with the groove, which chambers are controlled to have interior pressures of intermediate values between those of the spinning tube and the outer air, whereby the pressure pulsation of an air stream flowing into the interior of the spinning tube from the outer air through the groove can be avoided. This, in turn, ensures a smooth spinning operation and uniform yarn quality.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: October 25, 1988
    Assignee: Toray Industries, Inc.
    Inventors: Hasegawa Katsumi, Michio Ohno, Tadahito Nagayasu, Kazuo Umeda