Patents by Inventor Yuzi Hoshi

Yuzi Hoshi 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).

  • Preparation of sintered zirconia body
    Patent number: 5620637
    Abstract: A sintered zirconia sheet is prepared by firing a green sheet of zirconia while placing at least one weight on the sheet to apply a load thereto. Preferably a weight made of a porous material having a porosity of 5 to 30% and having a weight per unit area W (g/cm.sup.2) and a surface area S (cm.sup.2) is placed on the sheet to apply a load per unit area G (g/cm.sup.2) to the sheet under the conditions: S.ltoreq.200, G.ltoreq.5, and W/G.gtoreq.0.5. Sintered zirconia sheets free of camber, distortion or cracking are obtained, particularly when their dimensions are at least 15 cm.times.15 cm and up to 0.5 mm thick.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: April 15, 1997
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Takao Kaga, Yuzi Hoshi, Yutaka Kimura
  • Sintered body of alumina and partially stabilized zirconia, a process for making the same and a method of preparing a powder for sintering
    Patent number: 5338713
    Abstract: A powder for sintering is prepared by the wet mixing of a finely and uniformly divided alumina powder of high purity having a primary particle diameter not exceeding 0.15 micron and an average particle diameter not exceeding 0.3 micron, and a partially stabilized zirconia powder of high purity having an average particle diameter not exceeding 0.3 micron. After granulation and molding, the mixed powder is sintered at a temperature of 1300.degree. C. to 1500.degree. C. to make a sintered body having an average grain size not exceeding 0.7 micron.
    Type: Grant
    Filed: May 25, 1993
    Date of Patent: August 16, 1994
    Assignees: Agency of Industrial Science and Technology, Nissan Chemical Industries Ltd.
    Inventors: Hiroyoshi Takagi, Masanobu Awano, Yuzi Hoshi
  • Slurry composition and sintered part prepared therefrom
    Patent number: 5292693
    Abstract: A sheet-forming slurry composition is composed of zirconia powder, an organic binder, and a solvent. The zirconia powder contains 2 to 10 mol % of yttria in solid solution form and has a BET specific surface area of up to about 12 m.sup.2 /g and a mean particle size multiplied by the specific surface area of up to 3 .mu.m.m.sup.2 /g. The composition is formed into a green sheet having improved flexibility, binder removal capability, sinterability, and dimensional stability, which is then fired into a sintered part having improved denseness, gas barrier property, and surface smoothness.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: March 8, 1994
    Assignee: Nissan Chemical Industries, Limited
    Inventors: Takao Kaga, Yuzi Hoshi, Yutaka Kimura
  • Sintered body of light transmitting cordierite and a method of preparing the same
    Patent number: 5177033
    Abstract: A light transmitting sintered body of cordierite has a composition equal or close to the stoichiometric composition of cordierite which is represented as 2MgO.2Al.sub.2 O.sub.3.5SiO.sub.2, consists mainly of a phase of cordierite crystals, and has a total transmittance of at least 20%. A method of preparing it is also disclosed.
    Type: Grant
    Filed: May 21, 1991
    Date of Patent: January 5, 1993
    Assignees: Agency of Industrial Science and Technology, Nissan Chemical Industries, Ltd.
    Inventors: Masanobu Awano, Michihide Machida, Hiroyoshi Takagi, Yuzi Hoshi, Masamichi Obitsu
  • Oxide sintered product
    Patent number: 5002912
    Abstract: An oxide sintered product represented by the formula(TiO.sub.2).sub.1-x (SbO.sub.5/2)x(0.1.gtoreq.x.gtoreq.0.005)and having a bulk density of not less than 4.1 g/cm.sup.3.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: March 26, 1991
    Assignees: Agency of Industrial Science and Technology, Nissan Chemical Industries, Ltd., Tosoh Corporation
    Inventors: Hiroyoshi Takagi, Masanobu Awano, Yoshitaka Kubota, Yuzi Hoshi