Inventor

MASUDA HIROTAKA

JP4 patents

⚠️ This page may combine multiple inventors who share the name “MASUDA HIROTAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

NIPPON CHEMIPHAR CO

1 patent

US5294439AMar 15, 1994

Stabilized benzimidazole derivative and composition

NIPPON CHEMIPHAR CO27 citations82

OKAMOTO KEISHI

1 patent

US8430591B1Apr 30, 2013

Ballpoint pen tip and ballpoint pen

OKAMOTO KEISHI15 citations75

PILOT CORP

1 patent

US9375972B2Jun 28, 2016

Writing instrument

PILOT CORP0 citations45

PILOT CORPORATION KK

1 patent

US10087337B2Oct 2, 2018

Oil-based ball-point pen refill, oil-based ball-point pen, and oil-based ball-point pen ink composition

PILOT CORPORATION KK0 citations42