Inventor

TAKAYAMA KOUICHI

JP4 patents

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

PILOT CORPORATION KK

2 patents

US12220937B2Feb 11, 2025

Writing ball, method for manufacturing writing ball, and ballpoint pen with writing ball

PILOT CORPORATION KK0 citations55

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

OKAMOTO KEISHI

1 patent

US8430591B1Apr 30, 2013

Ballpoint pen tip and ballpoint pen

OKAMOTO KEISHI15 citations75

TAKAYAMA KOUICHI

1 patent

US9346313B2May 24, 2016

Ballpoint pen tip and ballpoint pen using the same

TAKAYAMA KOUICHI0 citations28