P

Inventor

SUMITOMO KOTARO

JP6 patents
⚠️ This page may combine multiple inventors who share the name “SUMITOMO KOTARO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SAKURA COLOR PROD CORP

3 patents
US7943684B2May 17, 2011

Process for production of black crayon

SAKURA COLOR PROD CORP0 citations50
US7485406B2Feb 3, 2009

Photostorage solid drawing medium

SAKURA COLOR PROD CORP0 citations50
US7291210B2Nov 6, 2007

Solid drawing material and method for producing the same

SAKURA COLOR PROD CORP1 citations49

SUMITOMO KOTARO

3 patents
US8431632B2Apr 30, 2013

Crayon

SUMITOMO KOTARO1 citations47
US8299143B2Oct 30, 2012

Crayon and process for producing the same

SUMITOMO KOTARO0 citations47
US8242190B2Aug 14, 2012

Crayon and process for producing the same

SUMITOMO KOTARO0 citations47