Inventor
HIRAI TAKESHI
JP21 patents
⚠️ This page may combine multiple inventors who share the name “HIRAI TAKESHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
AGC INC
13 patentsUS11898018B2Feb 13, 2024
Liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell
AGC INC2 citations71
US11840589B2Dec 12, 2023
Perfluoropolymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte water electrolyzer
AGC INC2 citations71
US11414502B2Aug 16, 2022
Fluorosulfonyl group or sulfonic acid group-containing polymer, its production method and its application
AGC INC2 citations71
US11242420B2Feb 8, 2022
Fluorosulfonyl group-containing compound, fluorosulfonyl group-containing monomer, and their production methods
AGC INC1 citations71
US12398228B2Aug 26, 2025
Method for producing fluorosulfonyl group-containing fluorinated polymer, method for producing salt-type sulfonic acid group- containing fluorinated polymer and method for producing acid-type sulfonic acid group-containing fluorinated polymer
AGC INC0 citations62
US12162966B2Dec 10, 2024
Sulfonic acid group-containing polymer, fluorosulfonyl group-containing polymer, and liquid composition
AGC INC0 citations62
US12187821B2Jan 7, 2025
Fluorosulfonyl group-containing compound, fluorosulfonyl group-containing monomer, and their production methods
AGC INC0 citations61
US11851508B2Dec 26, 2023
Acid-type sulfonic acid group-containing polymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly, polymer electrolyte fuel cell and ion exchange membrane for water electrolysis
AGC INC0 citations61
US12276035B2Apr 15, 2025
Polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte water electrolyzer
AGC INC0 citations60
US12098226B2Sep 24, 2024
Polymer, method for producing polymer, and method for producing membrane
AGC INC0 citations60
US11996595B2May 28, 2024
Polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell
AGC INC0 citations60
US12018106B2Jun 25, 2024
Fluorosulfonyl group-containing fluoropolymer and method for producing same, sulfonic acid group-containing fluoropolymer and method for producing same, solid polymer electrolyte membrane, membrane electrode assembly, and solid polymer fuel cell
AGC INC0 citations51
US12503583B2Dec 23, 2025
Perfluoropolymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell
AGC INC0 citations50