Inventor · disambiguated record
Stefan Wershofen
Also filed as: WERSHOFEN STEFAN
54 granted patents·7 pending applications·135 citations·filing 1992–2022
97Inventor score
Files withCOVESTRO DEUTSCHLAND AG24BAYER MATERIALSCIENCE AG13BAYER AG5WERSHOFEN STEFAN5BAYER IP GMBH3
Top patents by PatentIndex Score
61 records- 0194US7253321B2Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonationBAYER MATERIALSCIENCE AG·Filed 2005·Granted Aug 7, 2007·23 cites·9 claims
- 0292US10125091B2Process for preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2015·Granted Nov 13, 2018·7 cites·12 claims
- 0391US7186857B2Process for the preparation of di- and polyamines of the diphenylmethane seriesBAYER MATERIALSCIENCE AG·Filed 2005·Granted Mar 6, 2007·11 cites·5 claims
- 0490US11542223B1Process for preparing di- and polyamines of the diphenyl methane seriesCOVESTRO LLC·Filed 2022·Granted Jan 3, 2023·2 cites·21 claims
- 0590US10125090B2Process for preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2015·Granted Nov 13, 2018·4 cites·10 claims
- 0687US9328064B2Method for producing isocyanates in the gas phaseBAYER IP GMBH·Filed 2015·Granted May 3, 2016·2 cites·6 claims
- 0786US7692042B2Process for preparing anilineBAYER MATERIALSCIENCE AG·Filed 2007·Granted Apr 6, 2010·10 cites·12 claims
- 0885US9815769B2Process for the preparation of di- and polyamines from the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2014·Granted Nov 14, 2017·5 cites·7 claims
- 0983US9701617B2Process for producing diamines and polyamines of the diphenylmethane seriesWERSHOFEN STEFAN·Filed 2009·Granted Jul 11, 2017·6 cites·6 claims
- 1081US9695115B2Method for producing isocyanatesCOVESTRO DEUTSCHLAND AG·Filed 2016·Granted Jul 4, 2017·1 cites·5 claims
- 1179US10947187B2Method for producing methylene-diphenylene-diisocyanates and polymethylene-polyphenylene-polyisocyanatesCOVESTRO INTELLECTUAL PROPERTY GMBH & CO KG·Filed 2019·Granted Mar 16, 2021·1 cites·14 claims
- 1278US9272988B2Method for producing diisocyanates by phosgenating diamine suspensionsBAYER MATERIALSCIENCE AG·Filed 2013·Granted Mar 1, 2016·2 cites·9 claims
- 1378US7368595B2Process for the production of light-colored isocyanatesBAYER MATERIALSCIENCE AG·Filed 2007·Granted May 6, 2008·3 cites·7 claims
- 1477US6639102B2Process for producing polyisocyanates of the diphenyl methane series having a reduced color valueBAYER AG·Filed 2003·Granted Oct 28, 2003·9 cites·6 claims
- 1576US9593075B2Method for producing isocyanatesBAYER IP GMBH·Filed 2013·Granted Mar 14, 2017·1 cites·9 claims
- 1676US7041776B2Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane seriesBAYER AG·Filed 2003·Granted May 9, 2006·8 cites·9 claims
- 1775US8022200B2Process for the preparation of liquid, storage-stable organic isocyanates of low color number containing carbodiimide and/or uretonimine groupsBAYER MATERIALSCIENCE AG·Filed 2005·Granted Sep 20, 2011·3 cites·10 claims
- 1874US7745659B2Process for the production of liquid, storage-stable organic isocyanates with a low colour index having carbodiimide- and/or uretone imine groupsBAYER MATERIALSCIENCE AG·Filed 2005·Granted Jun 29, 2010·2 cites·4 claims
- 1973US9416094B2Process for the preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2014·Granted Aug 16, 2016·1 cites·10 claims
- 2072US10689322B2Process for preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2015·Granted Jun 23, 2020·1 cites·13 claims
- 2168US9284267B2Process for the preparation of urethanesJACOB ANDREAS·Filed 2009·Granted Mar 15, 2016·2 cites·7 claims
- 2268US7825276B2Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groupsBAYER MATERIALSCIENCE AG·Filed 2007·Granted Nov 2, 2010·2 cites·11 claims
- 2368US7813839B2Process for controlling a production processBAYER MATERIALSCIENCE AG·Filed 2007·Granted Oct 12, 2010·4 cites·42 claims
- 2467US9279029B2Method for producing light-coloured polyisocyanatesBAYER IP GMBH·Filed 2012·Granted Mar 8, 2016·1 cites·10 claims
- 2567US5347034AProcess for the production of poly(O-alkylurethanes) of the diphenyl methane seriesBAYER AG·Filed 1992·Granted Sep 13, 1994·10 cites·6 claims
- 2666US10689323B2Process for preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2018·Granted Jun 23, 2020·0 cites·10 claims
- 2766US9309184B2Method for producing diamines and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2014·Granted Apr 12, 2016·1 cites·9 claims
- 2866US7714148B2Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groupsBAYER MATERIALSCIENCE AG·Filed 2007·Granted May 11, 2010·1 cites·13 claims
- 2963US8513453B2Process for preparing aromatic carbamatesWERSHOFEN STEFAN·Filed 2010·Granted Aug 20, 2013·1 cites·16 claims
- 3062US8445713B2Catalyst for the synthesis of organic carbonates, process for preparing the same and application thereofWERSHOFEN STEFAN·Filed 2008·Granted May 21, 2013·1 cites·5 claims
- 3162US5399736AProcess for the preparation of highly pure aromatic diurethanes and/or polyurethanesBAYER AG·Filed 1992·Granted Mar 21, 1995·7 cites·17 claims
- 3261US2018304173A1Process for phase separation or extraction and device suitable thereforCOVESTRO DEUTSCHLAND AG·Filed 2018·Application pending·0 cites
- 3358US8338634B2Catalyst for the synthesis of alkyl carbamates, the method for preparing the same and the use thereofDENG YOUQUAN·Filed 2009·Granted Dec 25, 2012·1 cites·3 claims
- 3457US9475762B2Process for the preparation of urethanesCOVESTRO DEUTSCHLAND AG·Filed 2016·Granted Oct 25, 2016·0 cites·7 claims
- 3555US11406964B2Heterogeneous catalysts for the synthesis of carbamatesCOVESTRO INTELLECTUAL PROPERTY GMBH & CO KG·Filed 2019·Granted Aug 9, 2022·0 cites·16 claims
- 3654US9102594B2Method for producing isocyanates in the gas phaseBRUNS RAINER·Filed 2011·Granted Aug 11, 2015·0 cites·11 claims
- 3754US6667370B1Method for producing prepolymers containing isocyanate end groups, incorporating a small proportion of base isocyanatesBAYER AG·Filed 2000·Granted Dec 23, 2003·2 cites·5 claims
- 3853US2024018097A1Process for preparing a polyisocyanate, polyisocyanate, its use and polyaddition products prepared therefromCOVESTRO DEUTSCHLAND AG·Filed 2021·Application pending·0 cites
- 3952US7488850B2Process for removing compounds containing phenolic hydroxy groups from aromatic aminesBAYER MATERIALSCIENCE LLC·Filed 2007·Granted Feb 10, 2009·0 cites·9 claims
- 4052US2013244867A1Catalyst for producing n-substituted carbamates, and the preparation and application of the sameWERSHOFEN STEFAN·Filed 2013·Application pending·0 cites
- 4152US2014131275A1Process for phase separation or extraction and device suitable thereforPROPERTY GMBH BAYER INTELLECTUAL·Filed 2012·Application pending·0 cites
- 4251US10759736B2Process for the preparation of di- and polyamines of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2019·Granted Sep 1, 2020·0 cites·15 claims
- 4351US7205439B2Process for the preparation of di- and polyamines of the diphenylmethane seriesBAYER MATERIALSCIENCE AG·Filed 2006·Granted Apr 17, 2007·0 cites·8 claims
- 4450US9988344B2Zinc cluster compounds and their use as catalysts in the reaction of amines with dialkyl carbonatesCOVESTRO DEUTSCHLAND AG·Filed 2014·Granted Jun 5, 2018·0 cites·15 claims
- 4550US2023027482A1Method for producing di- and polyisocyanates of the diphenylmethane seriesCOVESTRO DEUTSCHLAND AG·Filed 2020·Application pending·0 cites
- 4649US8450516B2Catalyst for producing N-substituted carbamates, and the preparation and application of the sameWERSHOFEN STEFAN·Filed 2010·Granted May 28, 2013·0 cites·11 claims
- 4749US7662989B2Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretonimine groupsBAYER MATERIALSCIENCE AG·Filed 2007·Granted Feb 16, 2010·0 cites·17 claims
- 4848US10807084B2Silica-based zinc catalysts, their preparation and use in the alkoxycarbonylation of aminesCOVESTRO DEUTSCHLAND AG·Filed 2018·Granted Oct 20, 2020·0 cites·15 claims
- 4947US10633476B2Method for producing a composition comprising polycarbodiimide having improved storage stabilityCOVESTRO DEUTSCHLAND AG·Filed 2016·Granted Apr 28, 2020·0 cites·12 claims
- 5047US2007167633A1Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretonimine groupsBAYER MATERIALSCIENCE AG·Filed 2007·Application pending·0 cites
Showing the top 50 of 61 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →