Patents by Inventor Kyosuke Tsunekawa

Kyosuke Tsunekawa 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).

  • Underlying boards for firing and a method for firing ceramic moldings by using such underlying boards
    Patent number: 5529732
    Abstract: A firing underlying board having a long use life free from thermal expansion and which does not cause twisting of ribs, deformation of an end face, color change or cracking in a honeycomb structural body fired on the underlying board. The firing underlying board is composed mainly of 55-85 wt % of cordierite and 15-45 wt % of mullite. The firing underlying board is used to fire green ceramic honeycomb structural bodies placed thereon.
    Type: Grant
    Filed: September 21, 1994
    Date of Patent: June 25, 1996
    Assignee: NGK Insulators, Ltd.
    Inventors: Yoshiaki Ideguchi, Kyosuke Tsunekawa, Norio Kato
  • High strength zirconia ceramic
    Patent number: 4820667
    Abstract: A high strength zirconia ceramic composition consisting essentially of a compound of ZrO.sub.2 containing less than 5.0 mol % Y.sub.2 O.sub.3 as a stabilizer and further containing 1-30 wt % aluminum and magnesium contents to the amount of the compound of ZrO.sub.2 in terms of Al.sub.2 O.sub.3 and MgO. In the case that the compound of ZrO.sub.2 further contains CeO.sub.2 as a stabilizer, the total amount of Y.sub.2 O.sub.3 and CeO.sub.2 is determined to be 1.0-15 mol % to the amount of the compound of ZrO.sub.2.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: April 11, 1989
    Assignee: NGK Insulators, Ltd.
    Inventors: Kyosuke Tsunekawa, Ken Fukuta, Muneyuki Iwabuchi