Inventor · Marl, DE

Stephan Kohlstruk

48Patents
10h-index
76Co-inventors
78Inventor score

Filing activity: Nov 25, 1998 → Mar 18, 2019

Most-cited inventions

PatentTitleAreaCited byStatus
US6613863B2 Catalyst and process for preparing low-viscosity and color-reduced polyisocyanates containing isocyanurate groups Performing Operations; Transporting 19 Expired
US6552154B1 Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groups Chemistry; Metallurgy 17 Expired
US6924385B2 Method for synthesis of aliphatic isocyanates from aromatic isocyanates Chemistry; Metallurgy 17 Expired
US7001973B2 Catalyst and process for preparing low-viscosity and color-reduced polyisocyanates containing isocyanurate groups Performing Operations; Transporting 13 Expired
US10093605B2 Catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (β-isophorone) with hydrogen peroxide to afford 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) Chemistry; Metallurgy 13 Active
US6452003B1 Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates from isophorone diisocyanate Chemistry; Metallurgy 12 Expired
US6881785B2 Dispersions of amorphous unsaturated polyester resins based on particular Dicidol isomers Chemistry; Metallurgy 11 Expired
US6800714B2 Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groups Chemistry; Metallurgy 11 Expired
US9862673B2 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use Chemistry; Metallurgy 10 Active
US9868702B2 Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine Chemistry; Metallurgy 10 Active
US6730628B2 Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groups Chemistry; Metallurgy 10 Expired
US6093817A Process for preparing a reduced-color isocyanurate-functional polyisocyanate prepared from 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) Chemistry; Metallurgy 9 Expired
US10160717B2 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use Chemistry; Metallurgy 9 Active
US10214612B2 Epoxy resin composition comprising 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine as hardener Chemistry; Metallurgy 9 Active
US10221277B2 Epoxy resin composition comprising 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine (AM-CPDA) as hardener Chemistry; Metallurgy 9 Active
US10173979B2 Hardener composition including 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine Chemistry; Metallurgy 9 Active
US10125089B2 Process for preparing 3 aminomethyl-3,5,5-trimethylcyclohexylamine Chemistry; Metallurgy 8 Active
US9868699B2 Process for removing cations from an isophoronenitrile product mixture Emerging Cross-Sectional Technologies 6 Active
US6703471B2 Preparation of low-odor-storage-stable monomer-containing polyisocyanurates based on isophorone diisocyante Chemistry; Metallurgy 6 Expired
US6515096B2 Stable 1:1 monoadducts of secondary aminoalkylalkoxy-silanes and diisocyanates and a process for preparing them Chemistry; Metallurgy 6 Expired
US9878979B2 Fine purification of isophoronenitrile by melt crystallization Chemistry; Metallurgy 6 Active
US6495650B2 1,4-Diisocyanato-2,2,6-trimethylcyclohexane polyisocyanates containing isocyanurate groups, a process for the preparation and use Chemistry; Metallurgy 5 Expired
US10626131B2 Process for preparing isocyanates containing alkoxysilane groups Performing Operations; Transporting 4 Active
US10252980B1 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use Chemistry; Metallurgy 4 Active
US8816125B2 Process for the continuous preparation of (cyclo)aliphatic diisocyanates Chemistry; Metallurgy 4 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.