Patents by Inventor Makoto Tunashima

Makoto Tunashima 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).

  • Titanium dioxide reduced in volatile water content, process for producing the same, and masterbatch containing the same
    Patent number: 6126915
    Abstract: Titanium dioxide powder with a greatly decreased volatile moisture content can be obtained by surface treating with titanium dioxide powder with addition of a calcium salt and/or a silane coupling agent, or by a surface treatment by addition of an aluminate together with these surface treatments. A masterbatch containing this titanium dioxide powder is of high quality, having no defect due to foam generation upon high temperature processing.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: October 3, 2000
    Assignees: Tohkem Products Corporation, Toyo Ink Manufacturing Co., Ltd.
    Inventors: Makoto Tunashima, Kazuyoshi Muraoka, Kohji Yamamoto, Susumu Miyasita, Noburu Sakuma, Masaru Hosokawa
  • Stable anatase titanium dioxide and process for preparing the same
    Patent number: 6113873
    Abstract: To hydrous titanium dioxide obtained by hydrolysis of titanium sulfate was added a predetermined amount of a water-soluble aluminum compound and/or a water-soluble zinc compound, the mixture is calcined, and a suitable amount of aluminum and/or zinc is introduced into the crystals to make up the crystal defects of anatase-type titanium dioxide, so that it has increased stability and excellent color stability.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: September 5, 2000
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Makoto Tunashima, Kazuyoshi Muraoka, Kohji Yamamoto, Masaru Mikami, Suzuo Sasaki