Patents by Inventor Mitsuru Koketsu

Mitsuru Koketsu 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).

  • Thermal shock resistant porous sound absorbing body
    Patent number: 4481124
    Abstract: A thermal shock resistant porous sound absorbing body having high durability in which the prior drawbacks of sound absorbing bodies have been obviated, is produced by sintering a mixture comprising 100 parts by volume of ceramic particles having a bulk density of 1.2-2.0 kg/l, a grain size of 0.3-4.0 mm, a thermal expansion coefficient of less than 70.times.10.sup.-7 /.degree. C. and a fire resistant temperature of higher than 1,000.degree. C. and 4-18 parts by volume of an inorganic binder having a melting temperature of lower than that of the ceramic particles and a thermal expansion coefficient of lower than that of the ceramic particles, and further a sizing agent.
    Type: Grant
    Filed: January 7, 1983
    Date of Patent: November 6, 1984
    Assignee: NGK Insulators, Ltd.
    Inventors: Shosuke Koga, Mitsuru Koketsu, Yoshihiro Ohta, Seigo Satomi