Patents by Inventor Yoshiyuki Go

Yoshiyuki Go 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: 20240174786
    Abstract: A lignin-modified novolac-type phenol resin having a weight average molecular weight of equal to or more than 5500.
    Type: Application
    Filed: March 25, 2022
    Publication date: May 30, 2024
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Taketoshi Murai, Yoshiyuki Go
  • Patent number: 6946421
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermo-setting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: September 20, 2005
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Patent number: 6881812
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: April 19, 2005
    Assignee: Sumitomo Bakelite Company, Ltd.
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Publication number: 20040034125
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Application
    Filed: December 17, 2002
    Publication date: February 19, 2004
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Patent number: 6664344
    Abstract: The present invention provides an epoxy resin composition that has both a rapidly-curability and an excellent storage stability and is useful in the field of electronic and electric materials. That is, the present invention is an epoxy resin composition comprising a compound (A) having two or more epoxy groups in the molecule, a co-condensation product (B) having two or more phenolic hydroxyl groups in the molecule, and a molecular association product (C) of a tetra-substituted phosphonium (X), a compound (Y) having two or more phenolic hydroxyl groups in the molecule, and a conjugate base of the compound (Y) having two or more phenolic hydroxyl groups in the molecule, said conjugate base being a phenoxide type compound obtained by removing a hydrogen atom from the aforesaid compound (Y) having two or more phenolic hydroxyl groups in the molecule.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: December 16, 2003
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Hiromi Oki, Yoshiyuki Go, Sumiya Miyake, Yoshihito Akiyama
  • Publication number: 20030199391
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Application
    Filed: December 17, 2002
    Publication date: October 23, 2003
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Patent number: 6524989
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: February 25, 2003
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Publication number: 20010037003
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Application
    Filed: April 13, 2001
    Publication date: November 1, 2001
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Patent number: 6306792
    Abstract: The moisture resistance reliability of a latent catalyst is evaluated for a phosphonium borate wherein at least one group pendant on the boron atom is a group formed when a proton donor having at least one proton capable of being liberated out of the molecule has liberated one or at least two protons, the evaluation comprising (1) mixing one gram of the proton donor wherefrom the latent catalyst is derived with 50 grams of purified water to obtain an aqueous mixture, (3) subjecting the aqueous mixture to pressure cooker treatment at a temperature of 125° C. for 20 hours in a pressure cooker vessel to obtain an extraction mixture, and (4) measuring the electrical conductivity of the extraction mixture wherein the acceptable electrical conductivity of the extraction mixture is no greater than 1,000 &mgr;S/cm.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: October 23, 2001
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi
  • Publication number: 20010021454
    Abstract: This invention provides a latent catalyst having a structure of phosphonium borate consisting of a monovalent cation portion in which four specific groups are bonded to the phosphorus atom and a monovalent anion portion in which four specific groups are bonded to the boron atom, and a latent catalyst having a structure wherein the above phosphonium borate is the recurring unit and at least two of said recurring unit are connected through at least one of the four specific groups bonded to the boron atom. This invention also provides a thermosetting resin composition comprising such a latent catalyst and an epoxy resin molding material comprising such a latent catalyst and further provides a semiconductor device in which a semiconductor is encapsulated with said epoxy resin molding material.
    Type: Application
    Filed: April 19, 2001
    Publication date: September 13, 2001
    Inventors: Sumiya Miyake, Akiko Okubo, Hiromi Honda, Yoshiyuki Go, Hiroshi Nagata, Minoru Kobayashi