Inventor

KANI TAKAO

JP2 patents

Patents

2 patents

US6953345B1Oct 11, 2005

Water-metachromatic cloth sheet, toy set using the same, and writing instrument for water-metachromatic members

PILOT INK CO LTD26 citations89

US7168876B2Jan 30, 2007

Writing instrument for water-metachromatic members with detachable pen point holder

PILOT INK CO LTD7 citations70