Patents by Inventor Tatsuhiko Ogusu

Tatsuhiko Ogusu 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).

  • Polyethylene resin as a material of a container for a high purity chemical, and a container for a high purity chemical made thereof
    Patent number: 6225424
    Abstract: This invention aims at providing a polyethylene resin suitably used as a material of the container for a high purity chemical, which permits substantially no transference of fine particles and dissolution of metals into the chemical being minimized. This object is acheived by using a polyethylene resin having (1) to (5) properties described below as a material of the container for a high purity chemical: (1) a density of 0.94-0.97 g/cm3; (2) a melt flow rate under a load of 21.6 Kg at 190° C. of 2-50 g/10 minutes; (3) a ratio (Mw/Mn) of average molecular weight in weight (Mw) against average molecular weight in number (Mn) determined by gel permeation chromatography (GPC) of 8-15; (4) an extractable matter by boiling normal hexane of 0.1 weight % or less; and (5) a chlorine content of 15PPM or less with respect to the weight of polyethylene resin.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: May 1, 2001
    Assignee: Tosoh Corporation
    Inventors: Hiroaki Nishikawa, Tatsuhiko Ogusu