Inventor

IWASA ATSUSHI

JP6 patents

Patents

6 patents

US5965634AOct 12, 1999

Water base ink composition

MITSUBISHI PENCIL CO51 citations93

US5942560AAug 24, 1999

Colored resin fine particle water base dispersion liquid for water base ink

MITSUBISHI PENCIL CO40 citations90

US6517273B2Feb 11, 2003

Free-ink type writing instrument

MITSUBISHI PENCIL CO12 citations71

US5959000ASep 28, 1999

Erasable ink

MITSUBISHI PENCIL CO3 citations60

US7837404B2Nov 23, 2010

Applicator

MITSUBISHI PENCIL CO1 citations50

US6443649B1Sep 3, 2002

Free-ink type writing instrument

MITSUBISHI PENCIL CO0 citations49