Inventor
KUMA SHIGETOSHI
JP23 patents
⚠️ This page may combine multiple inventors who share the name “KUMA SHIGETOSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MITSUI CHEMICALS INC
21 patentsUS6770735B2Aug 3, 2004
Process for preparing a thiol compound
MITSUI CHEMICALS INC20 citations92
US6596841B2Jul 22, 2003
Polythiol, polymerizable composition, resin and lens, and process for preparing thiol compound
MITSUI CHEMICALS INC18 citations92
US8044165B2Oct 25, 2011
Process for producing resin for optical material
MITSUI CHEMICALS INC14 citations84
US6770734B2Aug 3, 2004
Polythiol compound
MITSUI CHEMICALS INC2 citations63
US7396900B2Jul 8, 2008
Thiourethane-based optical material
MITSUI CHEMICALS INC1 citations62
US7244808B2Jul 17, 2007
Thiourethane-based optical material
MITSUI CHEMICALS INC3 citations62
US11254783B2Feb 22, 2022
Xylylenediisocyanate composition, xylylenediisocyanate-modified composition, two-component resin material, and resin
MITSUI CHEMICALS INC0 citations61
US11840599B2Dec 12, 2023
Thiol-containing composition for optical material and polymerizable composition for optical material
MITSUI CHEMICALS INC0 citations52
US10696627B2Jun 30, 2020
Process for producing pentaerythritol mercaptocarboxylic acid ester, polymerizable composition, resin, optical material, and lens
MITSUI CHEMICALS INC0 citations52
US10640605B2May 5, 2020
Xylylenediisocyanate composition, xylylenediisocyanate-modified composition, two-component resin material, and resin
MITSUI CHEMICALS INC0 citations51
US9487475B2Nov 8, 2016
Preparation method of aldehyde compound with limited amount of acrylonitrile
MITSUI CHEMICALS INC1 citations51
US10399930B2Sep 3, 2019
Purification method of aldehyde compound
MITSUI CHEMICALS INC0 citations50
US10399929B2Sep 3, 2019
Purification method of aldehyde compound
MITSUI CHEMICALS INC0 citations50
US9809533B2Nov 7, 2017
Purification method of aldehyde compound
MITSUI CHEMICALS INC0 citations50
US10774038B2Sep 15, 2020
Process for producing cyanonorbornene
MITSUI CHEMICALS INC0 citations42
US10131767B2Nov 20, 2018
Polymerizable composition for optical material, optical material obtained from polymerizable composition, and manufacturing method of optical material
MITSUI CHEMICALS INC0 citations41
US9678246B2Jun 13, 2017
Polymerizable composition for optical material
MITSUI CHEMICALS INC0 citations41
US9464154B2Oct 11, 2016
Process for producing polyurethane resin
MITSUI CHEMICALS INC0 citations41
US10844010B2Nov 24, 2020
Process for producing (poly)sulfide compound and process for producing episulfide compound
MITSUI CHEMICALS INC0 citations40
US10196501B2Feb 5, 2019
Polymerizable composition for optical material, optical material produced from same, and process for producing same
MITSUI CHEMICALS INC0 citations40
US9475760B2Oct 25, 2016
Preparation method of aldehyde compound using a metal compound and a phosphorus compound
MITSUI CHEMICALS INC0 citations40