Patents by Inventor Hotishi Mantoku

Hotishi Mantoku 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 producing stretched article of ultrahigh-molecular weight polyethylene
    Patent number: 5055248
    Abstract: Stretched articles of ultrahigh-molecular-weight polyethylene are prepared by melt-kneading a mixture of ultrahigh-molecular-weight polyethylene with an aliphatic compound (b.sub.1) of at least 8 carbon atoms having a melting point of at least 10.degree. C. and a boiling point of at least 130.degree. C. in a screw extruder while maintaining the mixture at a temperature from the melting point of the mixture to 300.degree. C. The molten mixture is melt-extruded through a die at a temperature from the melting point of the mixture to 300.degree. C. and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is then subjected to a stretching treatment at a temperature of the melting point of the aliphatic compound (b.sub.1) to a point 20.degree. C. above the melting point of the mixture at a particular stretch ratio.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: October 8, 1991
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Masanori Motooka, Hotishi Mantoku, Kazuo Yagi, Hiroyuki Takeda, Kazuyuki Takimoto