Patents by Inventor Kazuhiko Kurafuchi

Kazuhiko Kurafuchi 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).

  • Publication number: 20190281697
    Abstract: One aspect of the present invention relates to a resin composition comprising a curable resin and a curing agent, which is used for forming an inter-wiring layer insulating layer in contact with a copper wiring.
    Type: Application
    Filed: September 26, 2017
    Publication date: September 12, 2019
    Inventors: Shinichiro ABE, Kazuhiko KURAFUCHI, Tomonori MINEGISHI, Kazuyuki MITSUKURA, Masaya TOBA
  • Patent number: 10388608
    Abstract: To provide a manufacturing method capable of manufacturing a high density semiconductor device excellent in transmission between chips at a favorable yield and at low cost. A method for manufacturing a semiconductor device includes an insulating layer forming step of forming an insulating layer 3 having a trench 4 above a substrate 1, a copper layer forming step of forming a copper layer 5a on the insulating layer 3 so as to fill the trench 4, and a removing step of removing the copper layer 5a on the insulating layer 3 by a fly cutting method so as to retain a copper layer part in the trench 4.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: August 20, 2019
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuyuki Mitsukura, Masaya Toba, Kenichi Iwashita, Kohsuke Urashima, Kazuhiko Kurafuchi
  • Patent number: 10363608
    Abstract: Provided is copper paste for joining including metal particles, and a dispersion medium. The metal particles include sub-micro copper particles having a volume-average particle size of 0.12 ?m to 0.8 ?m, and micro copper particles having a volume-average particle size of 2 ?m to 50 ?m, a sum of the amount of the sub-micro copper particles contained and the amount of the micro copper particles contained is 80% by mass or greater on the basis of a total mass of the metal particles, and the amount of the sub-micro copper particles contained is 30% by mass to 90% by mass on the basis of a sum of a mass of the sub-micro copper particles and a mass of the micro copper particles.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: July 30, 2019
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Yuki Kawana, Kazuhiko Kurafuchi, Yoshinori Ejiri, Hideo Nakako, Chie Sugama, Dai Ishikawa
  • Publication number: 20190109082
    Abstract: There are provided an organic interposer capable of improving insulation reliability and a method for manufacturing the organic interposer. An organic interposer 10 is provided with: an organic insulating laminate 12 comprising a plurality of organic insulating layers; and a plurality of wires 13 arranged in the organic insulating laminate 12, and each of the wires 13 and each of the organic insulating layers are separated by a barrier metal film 14. The organic insulating laminate 12 may include: a first organic insulating layer 21 having a plurality of grooves 21a each having each of the wires 13 disposed therein; and a second organic insulating layer 22 laminated to the first organic insulating layer 21 in such a way as to embed the wires 13.
    Type: Application
    Filed: February 23, 2017
    Publication date: April 11, 2019
    Inventors: Kazuyuki MITSUKURA, Masaya TOBA, Yoshinori EJIRI, Kazuhiko KURAFUCHI
  • Publication number: 20180342478
    Abstract: Provided is a joined body including: a first member; a second member; and a sintered metal layer that joins the first member and the second member. The sintered metal layer includes a structure that is derived from flake-shaped copper particles which are oriented in approximately parallel to an interface between the first member or the second member, and the sintered metal layer, and the amount of copper contained in the sintered metal layer is 65% by volume or greater on the basis of a volume of the sintered metal layer.
    Type: Application
    Filed: September 7, 2016
    Publication date: November 29, 2018
    Applicant: Hitachi Chemical Company, Ltd.
    Inventors: Hideo NAKAKO, Kazuhiko KURAFUCHI, Yoshinori EJIRI, Dai ISHIKAWA, Chie SUGAMA, Yuki KAWANA
  • Publication number: 20180337134
    Abstract: To provide a manufacturing method capable of manufacturing a high density semiconductor device excellent in transmission between chips at a favorable yield and at low cost. A method for manufacturing a semiconductor device includes an insulating layer forming step of forming an insulating layer 3 having a trench 4 above a substrate 1, a copper layer forming step of forming a copper layer 5a on the insulating layer 3 so as to fill the trench 4, and a removing step of removing the copper layer 5a on the insulating layer 3 by a fly cutting method so as to retain a copper layer part in the trench 4.
    Type: Application
    Filed: February 9, 2016
    Publication date: November 22, 2018
    Inventors: Kazuyuki MITSUKURA, Masaya TOBA, Kenichi IWASHITA, Kohsuke URASHIMA, Kazuhiko KURAFUCHI
  • Publication number: 20180250751
    Abstract: Provided is copper paste for joining including metal particles, and a dispersion medium. The metal particles include sub-micro copper particles having a volume-average particle size of 0.12 ?m to 0.8 ?m, and micro copper particles having a volume-average particle size of 2 ?m to 50 ?m, a sum of the amount of the sub-micro copper particles contained and the amount of the micro copper particles contained is 80% by mass or greater on the basis of a total mass of the metal particles, and the amount of the sub-micro copper particles contained is 30% by mass to 90% by mass on the basis of a sum of a mass of the sub-micro copper particles and a mass of the micro copper particles.
    Type: Application
    Filed: September 7, 2016
    Publication date: September 6, 2018
    Inventors: Yuki KAWANA, Kazuhiko KURAFUCHI, Yoshinori EJIRI, Hideo NAKAKO, Chie SUGAMA, Dai ISHIKAWA
  • Patent number: 10034384
    Abstract: A method for manufacturing a structure containing a conductor circuit according to the present invention can provide openings in various shapes by patterning a first photosensitive resin layer in a first patterning process according to shapes of openings formed in a heat-curable resin layer. Further, in the method for manufacturing a structure containing a conductor circuit, a plurality of openings can be formed at the same time and a residue of the resin around the opening can be reduced, unlike a case in which openings are formed with a laser. Therefore, it is possible to sufficiently efficiently manufacture the structure having excellent reliability even when the number of pins of a semiconductor element increases and it is necessary to provide a great number of fine openings.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: July 24, 2018
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuhiko Kurafuchi, Daisuke Fujimoto, Kunpei Yamada, Toshimasa Nagoshi
  • Patent number: 9661763
    Abstract: A method for manufacturing a structure containing a conductor circuit according to the present invention can provide openings in various shapes by patterning a first photosensitive resin layer in a first patterning process according to shapes of openings formed in a heat-curable resin layer. Further, in the method for manufacturing a structure containing a conductor circuit, a plurality of openings can be formed at the same time and a residue of the resin around the opening can be reduced, unlike a case in which openings are formed with a laser. Therefore, it is possible to sufficiently efficiently manufacture the structure having excellent reliability even when the number of pins of a semiconductor element increases and it is necessary to provide a great number of fine openings.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: May 23, 2017
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuhiko Kurafuchi, Daisuke Fujimoto, Kunpei Yamada, Toshimasa Nagoshi
  • Publication number: 20170020004
    Abstract: A method for manufacturing a structure containing a conductor circuit according to the present invention can provide openings in various shapes by patterning a first photosensitive resin layer in a first patterning process according to shapes of openings formed in a heat-curable resin layer. Further, in the method for manufacturing a structure containing a conductor circuit, a plurality of openings can be formed at the same time and a residue of the resin around the opening can be reduced, unlike a case in which openings are formed with a laser. Therefore, it is possible to sufficiently efficiently manufacture the structure having excellent reliability even when the number of pins of a semiconductor element increases and it is necessary to provide a great number of fine openings.
    Type: Application
    Filed: September 27, 2016
    Publication date: January 19, 2017
    Inventors: Kazuhiko KURAFUCHI, Daisuke FUJIMOTO, Kunpei YAMADA, Toshimasa NAGOSHI
  • Patent number: 9075307
    Abstract: The photosensitive resin composition for a protective film of a printed wiring board for a semiconductor package, according to the invention, comprises (A) an acid-modified vinyl group-containing epoxy resin, (B) a phenol compound, (C) a compound having at least one ethylenically unsaturated group in each molecule, (D) a photopolymerization initiator and (E) inorganic fine particles.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: July 7, 2015
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuhiko Kurafuchi, Toshizumi Yoshino, Hideyuki Katagi, Masaya Ookawa, Yoshiaki Fuse
  • Publication number: 20140251676
    Abstract: A method for manufacturing a structure containing a conductor circuit according to the present invention can provide openings in various shapes by patterning a first photosensitive resin layer in a first patterning process according to shapes of openings formed in a heat-curable resin layer. Further, in the method for manufacturing a structure containing a conductor circuit, a plurality of openings can be formed at the same time and a residue of the resin around the opening can be reduced, unlike a case in which openings are formed with a laser. Therefore, it is possible to sufficiently efficiently manufacture the structure having excellent reliability even when the number of pins of a semiconductor element increases and it is necessary to provide a great number of fine openings.
    Type: Application
    Filed: October 9, 2012
    Publication date: September 11, 2014
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuhiko Kurafuchi, Daisuke Fujimoto, Kunpei Yamada, Toshimasa Nagoshi
  • Publication number: 20110223539
    Abstract: The photosensitive resin composition for a protective film of a printed wiring board for a semiconductor package, according to the invention, comprises (A) an acid-modified vinyl group-containing epoxy resin, (B) a phenol compound, (C) a compound having at least one ethylenically unsaturated group in each molecule, (D) a photopolymerization initiator and (E) inorganic fine particles.
    Type: Application
    Filed: August 28, 2008
    Publication date: September 15, 2011
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Kazuhiko Kurafuchi, Toshizumi Yoshino, Hideyuki Katagi, Masaya Ookawa, Yoshiaki Fuse
  • Patent number: 6774501
    Abstract: A resin-sealed semiconductor device which comprises a lead frame having a die bond pad and an inner lead, a semiconductor chip installed on the die bond pad via a die bonding material and a sealing material for sealing the semiconductor chip and the lead frame, wherein properties of the die bonding material and the sealing material after curing satisfies the following formulae: &sgr;e≦0.2×&sgr;b formula (1) Ui≧2.0×10−6×&sgr;ei formula (2) Ud≧4.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: August 10, 2004
    Assignee: Hitachi Chemical Co., Ltd.
    Inventors: Kazuhiko Kurafuchi, Naoya Suzuki, Masaaki Yasuda, Tatsuo Kawata, Hiroyuki Sakai, Masao Kawasumi
  • Publication number: 20040000728
    Abstract: A resin-sealed semiconductor device which comprises a lead frame having a die bond pad and an inner lead, a semiconductor chip installed on the die bond pad via a die bonding material and a sealing material for sealing the semiconductor chip and the lead frame, wherein properties of the die bonding material and the sealing material after curing satisfies the following formulae: &sgr;e≦0.2×&sgr;b formula (1) Ui≧2.0×10−6×&sgr;ei formula (2) Ud≧4.
    Type: Application
    Filed: March 21, 2003
    Publication date: January 1, 2004
    Inventors: Kazuhiko Kurafuchi, Naoya Suzuki, Masaaki Yasuda, Tatsuo Kawata, Hiroyuki Sakai, Masao Kawasumi
  • Patent number: 6256875
    Abstract: The minimum spacing between wires disposed on a printed circuit board of a printed circuit board ball grid array package is reduced. Wiring layers are narrower than in the prior art because they are not plated and because only one metal layer is plated on the wiring layers. The narrower wiring layers can be formed easily with small spaces between wires.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: July 10, 2001
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Ryoden Semiconductor System Engineering Corporation
    Inventors: Masaki Watanabe, Akiyoshi Sawai, Yoshikazu Narutaki, Tomoaki Hashimoto, Masatoshi Yasunaga, Jun Shibata, Hiroshi Seki, Kazuhiko Kurafuchi, Katsunori Asai
  • Patent number: 6005289
    Abstract: The minimum spacing between wires disposed on a printed circuit board of a printed circuit board ball grid array package is reduced. Wiring layers are narrower than in the prior art because they are not plated and because only one metal layer is plated on the wiring layers. The narrower wiring layers can be formed easily with small spaces between wires.
    Type: Grant
    Filed: October 24, 1996
    Date of Patent: December 21, 1999
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Ryoden Semiconductor System Engineering Corporation
    Inventors: Masaki Watanabe, Akiyoshi Sawai, Yoshikazu Narutaki, Tomoaki Hashimoto, Masatoshi Yasunaga, Jun Shibata, Hiroshi Seki, Kazuhiko Kurafuchi, Katsunori Asai
  • Patent number: 5672965
    Abstract: An evaluation board for evaluating electrical characteristics of an IC package has an electrically insulating support board having signal wire patterns for contact by a measurement probe formed on a first surface and mounting pads for contact with solder balls of an IC package formed on a surface. The signal wire patterns and the mounting pads are electrically connected with each other via through holes formed in the support board. The signal wire patterns are surrounded by and spaced from a ground pattern formed on the first surface.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 30, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuhiko Kurafuchi, Hiroshi Seki, Mitsuyuki Takada
  • Patent number: 5410182
    Abstract: A semiconductor device having a rectangular COB substrate body, a die pad on the surface of the substrate body, a plurality of outer leads at the periphery of the substrate body, a plurality of wiring patterns on the surface of the substrate body connected to corresponding outer leads, a plurality of inner leads on the surface of the substrate body surrounding the die pad, connected to corresponding outer leads by the corresponding wiring patterns, and arranged in a substantially rectangular shape having sides, each respectively forming a predetermined acute angle with respect to a corresponding side of the substrate body whereby intervals between adjacent wiring patterns are longer than a predetermined length, a semiconductor chip having a plurality of electrode pads and mounted on the die pad, and a plurality of wires establishing electrical connections between the plurality of electrode pads of the semiconductor chip and corresponding inner leads.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: April 25, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuhiko Kurafuchi, Katsunori Ochi, Yoshiyuki Ishimaru, Kenji Kimura