Patents by Inventor Akihito TSUJINAKA

Akihito TSUJINAKA 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).

  • Lead-acid battery
    Patent number: 11894560
    Abstract: A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The positive electrode plate includes a positive current collector and a positive electrode material. The negative electrode plate includes a negative current collector and a negative electrode material. The positive current collector contains a lead alloy containing Ca and Sn. The content of Ca in the positive current collector is 0.2% by mass or less, and the content of Sn is 0.5% by mass or more. The negative electrode material contains a first organic expander (excluding a lignin compound) containing at least one selected from the group consisting of a unit of a monocyclic aromatic compound and a unit of a bisphenol S compound.
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: February 6, 2024
    Assignee: GS Yuasa International Ltd.
    Inventors: Yasunori Mizoguchi, Akihito Tsujinaka
  • Negative electrode plate containing organic expander in negative electrode material and lead-acid battery comprising the negative electrode plate
    Patent number: 11670757
    Abstract: A negative electrode plate for a lead-acid battery includes a negative electrode current collector and a negative electrode material. The negative electrode material contains an organic expander. The organic expander includes a condensate containing a bisphenol S unit and a phenolsulfonic acid unit.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: June 6, 2023
    Assignee: GS Yuasa International Ltd.
    Inventor: Akihito Tsujinaka
  • LEAD-ACID BATTERY
    Publication number: 20220344662
    Abstract: A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes a negative electrode material. The negative electrode material contains an organic expander and carbonaceous material. The organic expander contains a unit of a bisarene compound and a unit of a monocyclic aromatic compound having a hydroxy group. The unit of a bisarene compound is at least one selected from the group consisting of a unit of a bisphenol S compound and a unit of a bisphenol A compound.
    Type: Application
    Filed: September 24, 2020
    Publication date: October 27, 2022
    Inventors: Ryotaro WAMA, Akihito TSUJINAKA
  • LEAD-ACID BATTERY
    Publication number: 20220344668
    Abstract: A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The positive electrode plate includes a positive current collector and a positive electrode material. The negative electrode plate includes a negative current collector and a negative electrode material. The positive current collector contains a lead alloy containing Ca and Sn. The content of Ca in the positive current collector is 0.2% by mass or less, and the content of Sn is 0.5% by mass or more. The negative electrode material contains a first organic expander (excluding a lignin compound) containing at least one selected from the group consisting of a unit of a monocyclic aromatic compound and a unit of a bisphenol S compound.
    Type: Application
    Filed: September 24, 2020
    Publication date: October 27, 2022
    Inventors: Yasunori MIZOGUCHI, Akihito TSUJINAKA
  • NEGATIVE ELECTRODE PLATE FOR LEAD-ACID BATTERY AND LEAD-ACID BATTERY
    Publication number: 20210036308
    Abstract: A negative electrode plate for a lead-acid battery includes a negative electrode current collector and a negative electrode material. The negative electrode material contains an organic expander. The organic expander includes a condensate containing a bisphenol S unit and a phenolsulfonic acid unit.
    Type: Application
    Filed: March 26, 2019
    Publication date: February 4, 2021
    Inventor: Akihito TSUJINAKA