Patents by Inventor Mariko Hirose

Mariko Hirose 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).

  • Super microfibrillated cellulose, process for producing the same, and coated paper and tinted paper using the same
    Patent number: 6214163
    Abstract: A super microfibrillated cellulose having an arithmetic average fiber length of 0.05 to 0.1 mm, a water retention value of at least 350%, a rate of the number of fibers not longer than 0.25 mm of at least 95% based on the total number of the fibers as calculated by adding up, and an axial ratio of the fibers of at least 50. The super microfibrillated cellulose is produced by passing a slurry of a previously beaten pulp through a rubbing apparatus having two or more grinders which are arranged so that they can be rub together to microfibrillate the pulp to obtain microfibrillated cellulose and further super microfibrillate the obtained microfibrillated cellulose with a high-pressure homogenizer to obtain the super microfibrillated cellulose. A coated paper produced with a coating material containing the super microfibrillated cellulose, and a tinted paper produced from a paper stock containing the super microfibrillated cellulose as a carrier carrying a dye or pigment are also provided.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: April 10, 2001
    Assignee: Tokushu Paper Mfg. Co., Ltd.
    Inventors: Yuji Matsuda, Mariko Hirose, Katsuhiko Ueno
  • Super microfibrillated cellulose, process for producing the same, and coated paper and tinted paper using the same
    Patent number: 6183596
    Abstract: A super microfibrillated cellulose having an arithmetic average fiber length of 0.05 to 0.1 mm, a water retention value of at least 350%, a rate of the number of fibers not longer than 0.25 mm of at least 95% based on the total number of the fibers as calculated by adding up, and an axial ratio of the fibers of at least 50. The super microfibrillated cellulose is produced by passing a slurry of a previously beaten pulp through a rubbing apparatus having two or more grinders which are arranged so that they can be rub together to microfibrillate the pulp to obtain microfibrillated cellulose and further super microfibrillate the obtained microfibrillated cellulose with a high-pressure homogenizer to obtain the super microfibrillated cellulose. A coated paper produced with a coating material containing the super microfibrillated cellulose, and a tinted paper produced from a paper stock containing the super microfibrillated cellulose as a carrier carrying a dye or pigment are also provided.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: February 6, 2001
    Assignee: Tokushu Paper Mfg. Co., Ltd.
    Inventors: Yuji Matsuda, Mariko Hirose, Katsuhiko Ueno