Inventor · disambiguated record
Stephan Kohlstruk
Also filed as: KOHLSTRUK STEPHAN
48 granted patents·9 pending applications·443 citations·filing 1998–2024
98Inventor score
Files withDEGUSSA24EVONIK DEGUSSA GMBH16EVONIK OPERATIONS GMBH4NITZ JOERG-JOACHIM3HUELS CHEMISCHE WERKE AG2
Top patents by PatentIndex Score
57 records- 0196US10173979B2Hardener composition including 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamineEVONIK DEGUSSA GMBH·Filed 2017·Granted Jan 8, 2019·9 cites·11 claims
- 0295US10221277B2Epoxy resin composition comprising 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine (AM-CPDA) as hardenerEVONIK DEGUSSA GMBH·Filed 2017·Granted Mar 5, 2019·10 cites·19 claims
- 0395US10214612B2Epoxy resin composition comprising 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine as hardenerEVONIK DEGUSSA GMBH·Filed 2017·Granted Feb 26, 2019·11 cites·20 claims
- 0494US10160717B22-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and useEVONIK DEGUSSA GMBH·Filed 2017·Granted Dec 25, 2018·9 cites·18 claims
- 0594US9862673B22-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and useEVONIK DEGUSSA GMBH·Filed 2017·Granted Jan 9, 2018·10 cites·19 claims
- 0694US6552154B1Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groupsDEGUSSA·Filed 2000·Granted Apr 22, 2003·49 cites·10 claims
- 0793US10633401B2Process for preparing isocyanates containing alkoxysilane groupsEVONIK OPERATIONS GMBH·Filed 2019·Granted Apr 28, 2020·3 cites·20 claims
- 0893US10252980B12-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and useEVONIK DEGUSSA GMBH·Filed 2018·Granted Apr 9, 2019·4 cites·10 claims
- 0993US10093605B2Catalytic 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)EVONIK DEGUSSA GMBH·Filed 2017·Granted Oct 9, 2018·13 cites·20 claims
- 1093US9868702B2Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamineEVONIK DEGUSSA GMBH·Filed 2017·Granted Jan 16, 2018·10 cites·19 claims
- 1192US9878979B2Fine purification of isophoronenitrile by melt crystallizationNITZ JOERG-JOACHIM·Filed 2016·Granted Jan 30, 2018·6 cites·9 claims
- 1291US10626131B2Process for preparing isocyanates containing alkoxysilane groupsEVONIK DEGUSSA GMBH·Filed 2019·Granted Apr 21, 2020·4 cites·20 claims
- 1391US10125089B2Process for preparing 3 aminomethyl-3,5,5-trimethylcyclohexylamineEVONIK DEGUSSA GMBH·Filed 2016·Granted Nov 13, 2018·8 cites·27 claims
- 1491US9868699B2Process for removing cations from an isophoronenitrile product mixtureNITZ JOERG-JOACHIM·Filed 2016·Granted Jan 16, 2018·6 cites·18 claims
- 1590US6924385B2Method for synthesis of aliphatic isocyanates from aromatic isocyanatesDEGUSSA·Filed 2002·Granted Aug 2, 2005·23 cites·44 claims
- 1690US6800714B2Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groupsDEGUSSA·Filed 2003·Granted Oct 5, 2004·29 cites·16 claims
- 1789US6730628B2Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groupsDEGUSSA·Filed 2003·Granted May 4, 2004·27 cites·15 claims
- 1888US10669293B2Process for preparing isocyanates containing alkoxysilane groupsEVONIK DEGUSSA GMBH·Filed 2019·Granted Jun 2, 2020·3 cites·20 claims
- 1988US10611782B2Process for preparing isocyanates containing alkoxysilane groupsEVONIK DEGUSSA GMBH·Filed 2019·Granted Apr 7, 2020·3 cites·20 claims
- 2087US7001973B2Catalyst and process for preparing low-viscosity and color-reduced polyisocyanates containing isocyanurate groupsDEGUSSA·Filed 2003·Granted Feb 21, 2006·26 cites·27 claims
- 2186US6881785B2Dispersions of amorphous unsaturated polyester resins based on particular Dicidol isomersDEGUSSA·Filed 2003·Granted Apr 19, 2005·28 cites·32 claims
- 2286US6452003B1Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates from isophorone diisocyanateDEGUSSA·Filed 2001·Granted Sep 17, 2002·25 cites·38 claims
- 2385US6613863B2Catalyst and process for preparing low-viscosity and color-reduced polyisocyanates containing isocyanurate groupsDEGUSSA·Filed 2001·Granted Sep 2, 2003·31 cites·10 claims
- 2479US6703471B2Preparation of low-odor-storage-stable monomer-containing polyisocyanurates based on isophorone diisocyanteDEGUSSA·Filed 2002·Granted Mar 9, 2004·9 cites·20 claims
- 2576US8816125B2Process for the continuous preparation of (cyclo)aliphatic diisocyanatesMICHALCZAK HANS-WERNER·Filed 2007·Granted Aug 26, 2014·4 cites·14 claims
- 2676US8536370B2Low chlorine, multi-staged method for producing cycloaliphatic disocyanatesGRUND GERDA·Filed 2009·Granted Sep 17, 2013·3 cites·45 claims
- 2774US7371891B2Multistage continuous preparation of cycloaliphatic diisocyanatesDEGUSSA·Filed 2005·Granted May 13, 2008·2 cites·50 claims
- 2873US7557242B2Multistage continuous preparation of cycloaliphatic disocyanatesDEGUSSA·Filed 2005·Granted Jul 7, 2009·2 cites·49 claims
- 2973US7420080B2Multistage continuous preparation of cycloaliphatic diisocyanatesDEGUSSA·Filed 2005·Granted Sep 2, 2008·2 cites·53 claims
- 3072US8501861B2Polyolefin graft poly(meth)acrylate copolymer-based adhesion promoter for coating polyolefin surfacesKOHLSTRUK STEPHAN·Filed 2010·Granted Aug 6, 2013·2 cites·17 claims
- 3172US6515096B2Stable 1:1 monoadducts of secondary aminoalkylalkoxy-silanes and diisocyanates and a process for preparing themDEGUSSA·Filed 2001·Granted Feb 4, 2003·9 cites·14 claims
- 3271US9937483B2Process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamineEVONIK DEGUSSA GMBH·Filed 2016·Granted Apr 10, 2018·1 cites·23 claims
- 3370US7329776B2Multistage continuous preparation of cycloaliphatic diisocyanatesDEGUSSA·Filed 2004·Granted Feb 12, 2008·5 cites·119 claims
- 3468US9035102B2Hydrolysis of the residues obtained in the production of isophorone to recover isophorone and acetoneNITZ JOERG-JOACHIM·Filed 2014·Granted May 19, 2015·1 cites·34 claims
- 3568US7307186B2Multistage continuous preparation of cycloaliphatic diisocyanatesDEGUSSA·Filed 2004·Granted Dec 11, 2007·4 cites·54 claims
- 3668US2025197361A1Trimerization catalystsEVONIK OPERATIONS GMBH·Filed 2024·Application pending·0 cites
- 3764US8841479B2Low monomer 1 : 1 monoadducts of reactive olefinic compounds and diisocyanates using insertable inhibitorsSPYROU EMMANOUIL·Filed 2009·Granted Sep 23, 2014·1 cites·20 claims
- 3864US8729259B2Method for producing 1:1 adducts having a low monomer content from hydroxyalkyl(meth)acrylates and diisocyanatesSPYROU EMMANOUIL·Filed 2010·Granted May 20, 2014·1 cites·19 claims
- 3964US7339074B2Multistage continuous preparation of cycloaliphatic diisocyanatesDEGUSSA·Filed 2004·Granted Mar 4, 2008·3 cites·43 claims
- 4064US2025161906A1Method for removing gasesEVONIK OPERATIONS GMBH·Filed 2024·Application pending·0 cites
- 4163US6495650B21,4-Diisocyanato-2,2,6-trimethylcyclohexane polyisocyanates containing isocyanurate groups, a process for the preparation and useDEGUSSA·Filed 2001·Granted Dec 17, 2002·6 cites·13 claims
- 4262US9878500B2Composite semifinished products, molded parts produced therefrom, and molded parts produced directly based on hydroxy-functionalized (meth)acrylates, which are cross-linked by means of uretdiones in a thermosetting mannerSCHMITT GUENTER·Filed 2011·Granted Jan 30, 2018·2 cites·19 claims
- 4360US6093817AProcess for preparing a reduced-color isocyanurate-functional polyisocyanate prepared from 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI)HUELS CHEMISCHE WERKE AG·Filed 1998·Granted Jul 25, 2000·17 cites·10 claims
- 4460US2024317674A1Hydrogenation of aromatic amines from pu decomposition processesEVONIK OPERATIONS GMBH·Filed 2022·Application pending·0 cites
- 4559US6875243B2Catalysts for preparing polyisocyanates containing isocyanurate groups, and their useDEGUSSA·Filed 2002·Granted Apr 5, 2005·4 cites·48 claims
- 4657US6548696B2Low monomer 1:1-monoadducts from hydroxy (meth) acrylates and diisocyanates and a process for their manufactureDEGUSSA·Filed 2001·Granted Apr 15, 2003·5 cites·15 claims
- 4754US10519096B2Process for preparing amino compounds from nitrile compoundsEVONIK DEGUSSA GMBH·Filed 2018·Granted Dec 31, 2019·0 cites·20 claims
- 4844US10343975B2Coupling of distillative purification with a partial condenser for pre-purification of isophoronediamineEVONIK DEGUSSA GMBH·Filed 2017·Granted Jul 9, 2019·0 cites·15 claims
- 4944US6258915B1Solid polyurethane hardeners having triazine groups, processes for preparing such compounds, and their useDEGUSSA·Filed 1999·Granted Jul 10, 2001·7 cites·20 claims
- 5044US2017355810A1Epoxy resin composition comprising 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine as hardenerEVONIK DEGUSSA GMBH·Filed 2017·Application pending·0 cites
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