Patents by Inventor Yoko Fukuyama

Yoko Fukuyama 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).

  • Fibers, a process for preparing the same and product thereof
    Patent number: 5855624
    Abstract: The present invention relates to cellulose fibers excellent in dirt removability and a method of treatment thereof. The cellulose fibers of the invention are liquid ammonia-treated cellulose fibers whose partial or entire exterior is coated with an ester of (A) a polycarboxylic acid having at least three carboxyl groups and (B) a hydrophilic polyol having an oxyethylene group or groups and at least two alcoholic hydroxyl groups and/or which fibers are impregnated with the ester.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: January 5, 1999
    Assignee: New Japan Chemical Co., Ltd.
    Inventors: Kango Fujitani, Yoko Fukuyama, Toshio Watanuki, Hiroyuki Miura, Yutaka Tsujimoto, Kazuhisa Honda, Yoshitaka Uno, Yoshiaki Sakai
  • Formaldehyde-untreated cellulose fiber articles and process for producing same
    Patent number: 5536276
    Abstract: In treating a cellulose fiber article with 1,2,3,4-butanetetracarboxylic acid to improve properties, 1,2,3,4-butanetetracarboxylic acid containing up to 200 ppm of nitro radical is used, whereby the cellulose fiber article can be prevented from coloring to the utmost extent. The intended results of the invention can be achieved to a remarkable extent when using 1,2,3,4-butanetetracarboxylic acid containing up to 200 ppm of nitro radical and prepared by oxidizing tetrahydrophthalc acid and/or tetrahydrophthalic anhydride with hydrogen peroxide.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: July 16, 1996
    Assignee: New Japan Chemical Co., Ltd.
    Inventors: Kango Fujitani, Yoko Fukuyama