Patents by Inventor Sadao Sanada

Sadao Sanada 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).

  • Artificial hair and production thereof
    Patent number: 4916013
    Abstract: Disclosed herein is polyester-based aritifical hair composed of individual filaments having a thickness of 30 to 70 denier, with a deviation of plus and minus 20 denier, and a roughened surface formed such that the average intervals of adjacent pits are 0.1 to 1.5 .mu.m and the density of pits is 5 to 100 pits in a planer distance of 10 .mu.m. The artificial hair looks like natural hair and keeps its hair style and color unchanged when used both indoors and outdoors.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: April 10, 1990
    Assignee: Kuraray Co., Ltd.
    Inventors: Katsura Maeda, Masao Kawamoto, Sadao Sanada