Patents by Inventor Takanobu KAWAKAMI

Takanobu KAWAKAMI 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).

  • Method of producing sand mold comprising curing a resin and a binder by the same curing agent
    Patent number: 11590561
    Abstract: A method for producing a sand mold includes mixing artificial sand with a furan resin composition including a furan resin precursor, preparing molding sand having the artificial sand and a surface-modified layer containing a resin cured product covering the artificial sand and including a curing agent attached to the surface-modified layer by mixing the curing agent including xylene sulfonic acid with the artificial sand with which the furan resin composition is mixed, and curing the furan resin composition, after mixing the artificial sand with the furan resin composition, and curing an added portion of the binder in the molding sand by adding the binder to the molding sand. In the step of curing the added portion of the binder, the curing agent for curing the furan resin composition is used also as a curing agent for curing the binder.
    Type: Grant
    Filed: June 15, 2021
    Date of Patent: February 28, 2023
    Assignee: DAIHATSU MOTOR CO., LTD.
    Inventors: Takanobu Kawakami, Katsushi Morita, Akio Yamakawa, Kazuki Takada
  • METHOD OF PRODUCING SAND MOLD
    Publication number: 20210316356
    Abstract: A method for producing a sand mold includes mixing artificial sand with a furan resin composition including a furan resin precursor, preparing molding sand having the artificial sand and a surface-modified layer containing a resin cured product covering the artificial sand and including a curing agent attached to the surface-modified layer by mixing the curing agent including xylene sulfonic acid with the artificial sand with which the furan resin composition is mixed, and curing the furan resin composition, after mixing the artificial sand with the furan resin composition, and curing an added portion of the binder in the molding sand by adding the binder to the molding sand. In the step of curing the added portion of the binder, the curing agent for curing the furan resin composition is used also as a curing agent for curing the binder.
    Type: Application
    Filed: June 15, 2021
    Publication date: October 14, 2021
    Applicant: DAIHATSU MOTOR CO., LTD.
    Inventors: Takanobu KAWAKAMI, Katsushi MORITA, Akio YAMAKAWA, Kazuki TAKADA
  • METHOD FOR PRODUCING MOLDING SAND, AND MOLDING SAND
    Publication number: 20200188989
    Abstract: A method for producing molding sand includes mixing an artificial sand with a furan resin composition including a furan resin precursor, and mixing a curing agent with the artificial sand with which the furan resin composition is mixed, wherein the curing agent includes xylene sulfonic acid.
    Type: Application
    Filed: February 27, 2018
    Publication date: June 18, 2020
    Applicant: DAIHATSU MOTOR CO., LTD.
    Inventors: Takanobu KAWAKAMI, Katsushi MORITA, Akio YAMAKAWA, Kazuki TAKADA