Inventor
MASUSHIGE Naoto
JP5 patents
⚠️ This page may combine multiple inventors who share the name “MASUSHIGE Naoto”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PILOT CORPORATION KK
3 patentsUS11975560B2May 7, 2024
Ballpoint pen tip, ballpoint pen refill, and ballpoint pen
PILOT CORPORATION KK0 citations45
US10556459B2Feb 11, 2020
Writing instrument for forming thermochromic handwriting
PILOT CORPORATION KK0 citations45
US12421411B2Sep 23, 2025
Aqueous ink composition for reversibly thermochromic writing instrument, and refill and aqueous ballpoint pen incorporating aqueous ink composition for reversibly thermochromic writing instrument
PILOT CORPORATION KK0 citations35