Inventor
KUMAGAI WATARU
JP11 patents
⚠️ This page may combine multiple inventors who share the name “KUMAGAI WATARU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
UACJ CORP
6 patentsUS11423937B2Aug 23, 2022
Aluminum alloy substrate for magnetic disk, method for producing the same, and magnetic disk using aluminum alloy substrate for magnetic disk
UACJ CORP0 citations62
US12555602B2Feb 17, 2026
Magnetic disk substrate and magnetic disk using magnetic disk substrate
UACJ CORP0 citations61
US12243570B2Mar 4, 2025
Aluminum alloy substrate for magnetic disc and magnetic disc
UACJ CORP0 citations61
US12087342B2Sep 10, 2024
Aluminum alloy disc blank for magnetic disc and magnetic disc
UACJ CORP0 citations61
US12033665B2Jul 9, 2024
Thin substrate built-in hard disk drive and base plate member for thin substrate built-in hard disk drive
UACJ CORP0 citations61
US11721361B2Aug 8, 2023
Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using said aluminum alloy substrate for magnetic disks
UACJ CORP0 citations61
HITACHI METALS LTD
3 patentsFURUKAWA ELECTRIC CO LTD
2 patentsUS12573424B2Mar 10, 2026
Magnetic disk and substrate for magnetic disk
FURUKAWA ELECTRIC CO LTD0 citations51
US11335367B2May 17, 2022
Aluminum alloy substrate for magnetic disk, disk drive device, method for manufacturing aluminum alloy substrate for magnetic disk, and method for measuring aluminum alloy substrate for magnetic disk
FURUKAWA ELECTRIC CO LTD0 citations47