Patents by Inventor Hiromichi Kobayashi

Hiromichi Kobayashi 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).

  • Patent number: 5897916
    Abstract: A coated ceramic member includes a silicon nitride- or silicon carbide-based ceramic base material, a silicon nitride or silicon carbide film formed on the base material by CVD, and an oxide film formed on the film of CVD, and a process for producing the ceramic-coated member. This coated ceramic member maintains excellent durability under severe conditions, for example, in a high-speed combustion gas.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: April 27, 1999
    Assignee: NGK Insulators, LTD.
    Inventors: Hiromichi Kobayashi, Tomonori Takahashi, Yutaka Furuse, Yoshiaki Matsushita
  • Patent number: 5767027
    Abstract: An aluminum nitride sintered body is provided comprising metal elements contained in an amount of not more than 100 ppm for each metal element except for aluminum and assuming black color of a lightness of not more than N 4 according to the definition of JIS Z 8721. The aluminum nitride sintered body has preferably a relative density of at least 99.3% and crystal grains constituting the sintered body have an average particle diameter of at least 0.6 .mu.m but not more than 4.0 .mu.m. A powder of aluminum nitride obtained by reduction nitriding method is sintered at a temperature of at least 1,800.degree. C. under a pressure of at least 120 kg/cm.sup.2. Sintering temperature is preferably not more than 2,000.degree. C. and the sintering is preferably effected for at least 2 hrs but not more than 5 hrs.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: June 16, 1998
    Assignee: NGK Insulators, Ltd.
    Inventors: Atsushi Sakon, Ryusuke Ushikoshi, Koichi Umemoto, Hiromichi Kobayashi
  • Patent number: 5728635
    Abstract: An aluminum nitride sintered body is characterized by having a g-value of an unpaired electron in a spectrum of an electron spin resonance being not less than 2.0010. The aluminum nitride sintered body is produced by sintering a raw material composed of powdery aluminum nitride at a temperature of not less than 1730.degree. C. to not more than 1920.degree. under a pressure of not less than 80 kg/cm.sup.2.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: March 17, 1998
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiromichi Kobayashi, Yuki Bessho, Yukimasa Mori
  • Patent number: 5721062
    Abstract: A bonded article including first and second ceramic bodies each comprising ceramic particles provided in an intergranular phase. The ceramic bodies are joined together along a plane forming a bonding interface, wherein ceramic particles of the bodies along the bonding interface have joined and grown together so as to extend across the bonding interface via solid phase sintering. The intergranular phase includes a bonding material, and the bonding interface is rich in said bonding a material. The bonded article has improved strength and gas-tight sealing characteristics.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 24, 1998
    Assignee: NGK Insulators, Ltd.
    Inventor: Hiromichi Kobayashi
  • Patent number: 5683824
    Abstract: A coated ceramic member includes a silicon nitride- or silicon carbide-based ceramic base material, a silicon nitride or silicon carbide film formed on the base material by CVD, and an oxide film formed on the film of CVD, and a process for producing the ceramic-coated member. This coated ceramic member maintains excellent durability under severe conditions, for example, in a high-speed combustion gas.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: November 4, 1997
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiromichi Kobayashi, Tomonori Takahashi, Yutaka Furuse, Yoshiaki Matsushita
  • Patent number: 5595850
    Abstract: A ferrite carrier for electrophotographic developers which comprises a Mn-Mg ferrite having the general formula(MnO).sub.x (MgO).sub.y (Fe.sub.2 O.sub.3).sub.zwherein x+y+z=100 mol % and SrO is substituted for a part of MnO, MgO and/or Fe.sub.2 O.sub.3.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: January 21, 1997
    Assignee: Powdertech Co., Ltd.
    Inventors: Toshio Honjo, Yuji Sato, Kanao Kayamoto, Masahiro Ogata, Hiromichi Kobayashi
  • Patent number: 5306895
    Abstract: An excellent corrosion resistant member of a ceramic heater for semiconductor production apparatuses to be exposed to a halogen series corrosive gas is provided. The corrosion resistant member uses one of an aluminum nitride and alumina sintered body as a substrate. A ceramic heater using the corrosion resistive member is also disclosed as well as a semiconductor heating device using the ceramic heater.
    Type: Grant
    Filed: March 26, 1992
    Date of Patent: April 26, 1994
    Assignee: NGK Insulators, Ltd.
    Inventors: Ryusuke Ushikoshi, Kazuhiro Nobori, Yusuke Niori, Koichi Umemoto, Hiromichi Kobayashi, Toshihiko Honda, Kenji Kawabata
  • Patent number: 5035633
    Abstract: Disclosed is a data-processing apparatus comprising a data-processing unit, a connector unit, a pin-protecting member, and lock members. The lock members hold the pin-protecting member in a first position where the pin-protecting member opposes the pins and prevents anything other than the card-shaped recording medium from abutting on the pins and protects the pins from dust. When a card-shaped recording medium is inserted into the apparatus, the lock members release the pin-protecting member from the first position, whereby the pin-protecting member is moved to a second position. In the second position, the pin-protecting member allows an electrical connection between the pins and the connector of the recording medium. When the recording medium is pulled from the apparatus, the pin-protecting member is moved from the second position back to the first position.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: July 30, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiromichi Kobayashi, Fumio Izawa
  • Patent number: 4879596
    Abstract: In a sterescopic camera supporting apparatus of this invention, first and second image pickup elements incorporated in first and second cameras which are independent of each other so as to obtain a stereoscopic image are attached to corresponding holders by elongated apertures formed in mounting portions of the first and second cameras and screws loosely fitted in the elongated apertures, so as to be pivotally adjusted in plane directions perpendicular to optical axes of the first and second cameras. The first camera is attached to a first sub frame by elongated apertures formed in the mounting portion of the first camera and screws loosely fitted in the elongated apertures to be vertically pivoted about the optical axis for adjustment.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: November 7, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kenichi Miura, Hiromichi Kobayashi