Patents by Inventor Mituo Kajiwara

Mituo Kajiwara 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).

  • Method of producing resin sheet with roughened surface
    Patent number: 5169583
    Abstract: A crystalline resin sheet having one, smooth surface and the other, roughened surface is produced by extruding a melt of the resin through a die to form a molten sheet, the molten sheet being subsequently contacted, at only one of the both surfaces thereof, with a cooled, smooth surface maintained at a temperature lower by 20.degree.-90.degree. C. than the melting point of the resin to solidify the molten sheet and to make the contacted surface of the sheet smooth. The other surface of the sheet which has not been contacted with a cooled surface becomes roughened because of the crystallization of the resin.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: December 8, 1992
    Assignee: Somar Corporation
    Inventors: Kazutomo Moriguchi, Mituo Kajiwara, Ikuo Sekiguchi