Patents by Inventor Tetsuji Maruno

Tetsuji Maruno 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: 7817402
    Abstract: A multilayer ceramic capacitor 1 having dielectric layers 2 and internal electrode layers 3 formed using a conductor paste, wherein the conductor paste contains a conductive material, the conductive material is comprised of a first ingredient and second ingredient, the first ingredient includes metal elements having Ni as a main ingredient, and the second ingredient includes a metal element dissolving in the first ingredient and having a melting point of 1490° C. or more.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: October 19, 2010
    Assignee: TDK Corporation
    Inventors: Shuichi Miura, Kazuhiko Oda, Tetsuji Maruno
  • Patent number: 7632427
    Abstract: A conductive paste used for forming internal electrodes of a multilayer ceramic electronic device, used in combination with ceramic green sheets, each containing a butyral resin and having a thickness of 5 ?m or less, and including a conductive powder and an organic vehicle, a solvent in said organic vehicle having terpineol acetate as its main ingredient, whereby there is little change in viscosity along with time and no occurrence of sheet attack.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: December 15, 2009
    Assignee: TDK Corporation
    Inventors: Kazuhiko Oda, Tetsuji Maruno, Shuichi Miura, Makoto Takahashi, Tatsuya Kojima
  • Patent number: 7435360
    Abstract: A manufacturing method of conductive paste comprising arranging process (S20 to S23) of ceramics particles, arranging process (S10 to S14) of wetted metal particles, forming process (S30) of slurry wherein metal particles and ceramics particles are mixed and dispersion treatment process (S32) by applying collision to the slurry. The arranging process of wetted metal particles comprises, a process (S12) of adding solvent, compatible with organic component in conductive paste and incompatible with water, to undried water washed metal particles, a process (S18) of adding surfactant, a process (S14) of separating water from the metal particles and a process (S15) of adding acetone or the other second solvent.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: October 14, 2008
    Assignee: TDK Corporation
    Inventors: Kazuhiko Oda, Tetsuji Maruno, Akira Sasaki, Kouji Tanaka
  • Patent number: 7413699
    Abstract: A ceramic electronic element having improved the continuity of inner electrode layers while suppressing the decrease in adhesion between its dielectric layers and inner electrode layers and the deterioration in functions of the inner electrode layers, and a method of making the same are provided. In the method of making a ceramic capacitor (10) in accordance with the present invention, an electrode paste (22) is applied to a surface (20a) of a green sheet (20) and fired, so as to form a dielectric layer (12) laminated with an electrode layer (14). Since the electrode paste (22) is doped with a BaTiO3 powder, the adhesion between the dielectric layer (22) and inner electrode layer (14) after firing is significantly restrained from lowering, and the sintering start temperature of the electrode paste (22) is close to that of the green sheet (20).
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: August 19, 2008
    Assignee: TDK Corporation
    Inventors: Shuichi Miura, Tetsuji Maruno, Kazuhiko Oda, Akira Sasaki, Kouji Tanaka
  • Patent number: 7182977
    Abstract: A composite substance for forming a conductive paste, comprises a solvent and metal or metal compound particles. The solvent is compatible with an organic component included in the conductive paste, and the metal or metal compound particles are dried metal or metal compound particles having the second solvent adhering to the surface thereof. The conductive paste comprises an organic vehicle, a solvent, and the composite substance which is mixed with the organic vehicle and the solvent. The method for manufacturing the composite substance comprises the steps of washing metal or metal compound particles with water, adding a solvent that is compatible with an organic component included in the conductive paste, thereby replacing water components, and drying the metal or metal compound particles having the solvent adhering to the surface thereof.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: February 27, 2007
    Assignee: TDK Corporation
    Inventors: Tetsuji Maruno, Kazuhiko Oda, Akira Sasaki, Kouji Tanaka
  • Publication number: 20060221547
    Abstract: A multilayer ceramic capacitor 1 having dielectric layers 2 and internal electrode layers 3 formed using a conductor paste, wherein the conductor paste contains a conductive material, the conductive material is comprised of a first ingredient and second ingredient, the first ingredient includes metal elements having Ni as a main ingredient, and the second ingredient includes a metal element dissolving in the first ingredient and having a melting point of 1490° C. or more.
    Type: Application
    Filed: March 24, 2006
    Publication date: October 5, 2006
    Applicant: TDK CORPORATION
    Inventors: Shuichi Miura, Kazuhiko Oda, Tetsuji Maruno
  • Publication number: 20060011896
    Abstract: A conductive paste used for forming internal electrodes of a multilayer ceramic electronic device, used in combination with ceramic green sheets, each containing a butyral resin and having a thickness of 5 ?m or less, and including a conductive powder and an organic vehicle, a solvent in said organic vehicle having terpineol acetate as its main ingredient, whereby there is little change in viscosity along with time and no occurrence of sheet attack.
    Type: Application
    Filed: June 20, 2005
    Publication date: January 19, 2006
    Applicant: TDK CORPORATION
    Inventors: Kazuhiko Oda, Tetsuji Maruno, Shuichi Miura, Makoto Takahashi, Tatsuya Kojima
  • Publication number: 20050067744
    Abstract: A ceramic electronic element having improved the continuity of inner electrode layers while suppressing the decrease in adhesion between its dielectric layers and inner electrode layers and the deterioration in functions of the inner electrode layers, and a method of making the same are provided. In the method of making a ceramic capacitor (10) in accordance with the present invention, an electrode paste (22) is applied to a surface (20a) of a green sheet (20) and fired, so as to form a dielectric layer (12) laminated with an electrode layer (14). Since the electrode paste (22) is doped with a BaTiO3 powder, the adhesion between the dielectric layer (22) and inner electrode layer (14) after firing is significantly restrained from lowering, and the sintering start temperature of the electrode paste (22) is close to that of the green sheet (20).
    Type: Application
    Filed: September 17, 2004
    Publication date: March 31, 2005
    Applicant: TDK CORPORATION
    Inventors: Shuichi Miura, Tetsuji Maruno, Kazuhiko Oda, Akira Sasaki, Kouji Tanaka
  • Publication number: 20040188658
    Abstract: A manufacturing method of conductive paste comprising arranging process (S20 to S23) of ceramics particles, arranging process (S10 to S14) of wetted metal particles, forming process (S30) of slurry wherein metal particles and ceramics particles are mixed and dispersion treatment process (S32) by applying collision to the slurry. The arranging process of wetted metal particles comprises, a process (S12) of adding solvent, compatible with organic component in conductive paste and incompatible with water, to undried water washed metal particles, a process (S18) of adding surfactant, a process (S14) of separating water from the metal particles and a process (S15) of adding acetone or the other second solvent.
    Type: Application
    Filed: March 19, 2004
    Publication date: September 30, 2004
    Applicant: TDK CORPORATION
    Inventors: Kazuhiko Oda, Tetsuji Maruno, Akira Sasaki, Kouji Tanaka
  • Publication number: 20030042469
    Abstract: A composite substance for forming a conductive paste, comprises a solvent and metal or metal compound particles. The solvent is compatible with an organic component included in the conductive paste, and the metal or metal compound particles are dried metal or metal compound particles having the second solvent adhering to the surface thereof. The conductive paste comprises an organic vehicle, a solvent, and the composite substance which is mixed with the organic vehicle and the solvent. The method for manufacturing the composite substance comprises the steps of washing metal or metal compound particles with water, adding a solvent that is compatible with an organic component included in the conductive paste, thereby replacing water components, and drying the metal or metal compound particles having the solvent adhering to the surface thereof.
    Type: Application
    Filed: August 15, 2002
    Publication date: March 6, 2003
    Applicant: TDK CORPORATION
    Inventors: Tetsuji Maruno, Kazuhiko Oda, Akira Sasaki, Kouji Tanaka