Wershofen; Stefan

Patent Applications and Registrations

Patent applications and USPTO patent grants for Wershofen; Stefan.The latest application filed is for "heterogeneous catalysts for the synthesis of carbamates".

Company Profile

22.60.56

Wershofen; Stefan - Monchengladbach DE
Wershofen; Stefan - Moenchengladbach DE
Wershofen; Stefan - Monchenglabach DE
Wershofen; Stefan - Monchenladbach DE
Wershofen; Stefan - Monchengladback DE

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Heterogeneous catalysts for the synthesis of carbamates Grant 11,406,964 - Wershofen , et al. August 9, 2	2022-08-09
Method for producing methylene-diphenylene-diisocyanates and polymethylene-polyphenylene-polyisocyanates Grant 10,947,187 - Knauf , et al. March 16, 2	2021-03-16
Heterogeneous Catalysts For The Synthesis Of Carbamates App 20210053031 - Wershofen; Stefan ; et al.	2021-02-25
Method for producing isocyanates Grant 10,858,310 - Cozzula , et al. December 8, 2	2020-12-08
Method For Producing Isocyanates App 20200361856 - Cozzula; Daniela ; et al.	2020-11-19
Method For Producing Methylene-diphenylene-diisocyanates And Polymethylene-polyphenylene-polyisocyanates App 20200331848 - Knauf; Thomas ; et al.	2020-10-22
Silica-based zinc catalysts, their preparation and use in the alkoxycarbonylation of amines Grant 10,807,084 - Wershofen , et al. October 20, 2	2020-10-20
Process for the preparation of di- and polyamines of the diphenylmethane series Grant 10,759,736 - Wershofen , et al. Sep	2020-09-01
Process for preparation of di- and polyamines of the diphenylmethane series Grant 10,689,323 - Knauf , et al.	2020-06-23
Process for preparation of di- and polyamines of the diphenylmethane series Grant 10,689,322 - Knauf , et al.	2020-06-23
Silica-based Zinc Catalysts, Their Preparation And Use In The Alkoxycarbonylation Of Amines App 20200147594 - Wershofen; Stefan ; et al.	2020-05-14
Method of producing diamines and polyamines of the diphenylmethane series Grant 10,640,455 - Knauf , et al.	2020-05-05
Method of producing diamines and polyamines of the diphenylmethane series Grant 10,640,453 - Knauf , et al.	2020-05-05
Method for producing a composition comprising polycarbodiimide having improved storage stability Grant 10,633,476 - Arntz , et al.	2020-04-28
Method of producing diamines and polyamines of the diphenylmethane series at different production capacities Grant 10,633,327 - Knauf , et al.	2020-04-28
Process For The Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20200123096 - WERSHOFEN; Stefan ; et al.	2020-04-23
Method of producing diamines and polyamines of the diphenylmethane series at different production capacities Grant 10,626,078 - Knauf , et al.	2020-04-21
Method Of Producing Diamines And Polyamines Of The Diphenylmethane Series App 20200115318 - KNAUF; Thomas ; et al.	2020-04-16
Method Of Producing Diamines And Polyamines Of The Diphenylmethane Series At Different Production Capacities App 20200115319 - KNAUF; Thomas ; et al.	2020-04-16
Method Of Producing Diamines And Polyamines Of The Diphenylmethane Series At Different Production Capacities App 20200087244 - KNAUF; Thomas ; et al.	2020-03-19
Method Of Producing Diamines And Polyamines Of The Diphenylmethane Series App 20200087243 - KNAUF; Thomas ; et al.	2020-03-19
Methods for producing chemical products with operation interruptions Grant 10,513,487 - Knauf , et al. Dec	2019-12-24
Method for producing isocyanates Grant 10,280,135 - Knauf , et al.	2019-05-07
Process for the production of di- and polyamines of the diphenylmethane series Grant 10,239,984 - Arras , et al.	2019-03-26
Process For Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20190023647 - Knauf; Thomas ; et al.	2019-01-24
Process for preparation of di- and polyamines of the diphenylmethane series Grant 10,125,091 - Knauf , et al. November 13, 2	2018-11-13
Process for preparation of di- and polyamines of the diphenylmethane series Grant 10,125,090 - Knauf , et al. November 13, 2	2018-11-13
Process For Phase Separation Or Extraction And Device Suitable Therefor App 20180304173 - Temme; Bodo ; et al.	2018-10-25
Method For Producing Isocyanates App 20180265457 - Knauf; Thomas ; et al.	2018-09-20
Zinc cluster compounds and their use as catalysts in the reaction of amines with dialkyl carbonates Grant 9,988,344 - Dreier , et al. June 5, 2	2018-06-05
Method For Producing A Composition Comprising Polycarbodiimide Having Improved Storage Stability App 20180009929 - Arntz; Hans-Detlef ; et al.	2018-01-11
Process for the preparation of di- and polyamines from the diphenylmethane series Grant 9,815,769 - Knauf , et al. November 14, 2	2017-11-14
Process for producing diamines and polyamines of the diphenylmethane series Grant 9,701,617 - Wershofen , et al. July 11, 2	2017-07-11
Method for producing isocyanates Grant 9,695,115 - Bruns , et al. July 4, 2	2017-07-04
Process For The Production Of Di- And Polyamines Of The Diphenylmethane Series App 20170158798 - Arras; Jurgen ; et al.	2017-06-08
Methods For Producing Chemical Products With Operation Interruptions App 20170152210 - KNAUF; Thomas ; et al.	2017-06-01
Process For Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20170137367 - Knauf; Thomas ; et al.	2017-05-18
Process For Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20170114000 - Knauf; Thomas ; et al.	2017-04-27
Process For Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20170107171 - Knauf; Thomas ; et al.	2017-04-20
Method for producing isocyanates Grant 9,593,075 - Bruns , et al. March 14, 2	2017-03-14
Method For Producing Isocyanates App 20160376228 - Bruns; Rainer ; et al.	2016-12-29
Process for the preparation of urethanes Grant 9,475,762 - Jacob , et al. October 25, 2	2016-10-25
Process for the preparation of di- and polyamines of the diphenylmethane series Grant 9,416,094 - Knauf , et al. August 16, 2	2016-08-16
Zinc Cluster Compounds And Their Use As Catalysts In The Reaction Of Amines With Dialkyl Carbonates App 20160194277 - Dreier; Thorsten ; et al.	2016-07-07
Process For The Preparation Of Urethanes App 20160152559 - Jacob; Andreas ; et al.	2016-06-02
Method for producing isocyanates in the gas phase Grant 9,328,064 - Bruns , et al. May 3, 2	2016-05-03
Method for producing diamines and polyamines of the diphenylmethane series Grant 9,309,184 - Knauf , et al. April 12, 2	2016-04-12
Process for the preparation of urethanes Grant 9,284,267 - Jacob , et al. March 15, 2	2016-03-15
Method For Producing Diamines And Polyamines Of The Diphenylmethane Series App 20160068475 - Knauf; Thomas ; et al.	2016-03-10
Process For The Preparation Of Di- And Polyamines Of The Diphenylmethane Series App 20160068473 - Knauf; Thomas ; et al.	2016-03-10
Process For The Preparation Of Di- And Polyamines From The Diphenylmethane Series App 20160068474 - Knauf; Thomas ; et al.	2016-03-10
Method for producing light-coloured polyisocyanates Grant 9,279,029 - Mueller , et al. March 8, 2	2016-03-08
Method for producing diisocyanates by phosgenating diamine suspensions Grant 9,272,988 - Laue , et al. March 1, 2	2016-03-01
Process for the preparation of urethanes Grant 9,199,924 - Gartner , et al. December 1, 2	2015-12-01
Method For Producing Isocyanates In The Gas Phase App 20150299111 - BRUNS; Rainer ; et al.	2015-10-22
Method For Producing Isocyanates App 20150291512 - Burns; Rainer ; et al.	2015-10-15
Method For Producing Diisocyanates By Phosgenating Diamine Suspensions App 20150246873 - Laue; Jorg ; et al.	2015-09-03
Method for producing isocyanates in the gas phase Grant 9,102,594 - Bruns , et al. August 11, 2	2015-08-11
Process For Phase Separation Or Extraction And Device Suitable Therefor App 20140131275 - Temme; Bodo ; et al.	2014-05-15
Method For Producing Urethanes App 20130303740 - Gartner; Felix ; et al.	2013-11-14
Catalyst For Producing N-substituted Carbamates, And The Preparation And Application Of The Same App 20130244867 - Wershofen; Stefan ; et al.	2013-09-19
Process for preparing aromatic carbamates Grant 8,513,453 - Wershofen , et al. August 20, 2	2013-08-20
Method for preparing a carbamate, a catalyst applied in the method, a method for preparing the catalyst and use thereof Grant 8,450,518 - Deng , et al. May 28, 2	2013-05-28
Catalyst for producing N-substituted carbamates, and the preparation and application of the same Grant 8,450,516 - Wershofen , et al. May 28, 2	2013-05-28
Method For Producing Isocyanates In The Gas Phase App 20130131377 - Bruns; Rainer ; et al.	2013-05-23
Catalyst for the synthesis of organic carbonates, process for preparing the same and application thereof Grant 8,445,713 - Wershofen , et al. May 21, 2	2013-05-21
Catalyst for the synthesis of alkyl carbamates, the method for preparing the same and the use thereof Grant 8,338,634 - Deng , et al. December 25, 2	2012-12-25
Process For Preparing Aromatic Carbamates App 20120041223 - Wershofen; Stefan ; et al.	2012-02-16
Process for the preparation of liquid, storage-stable organic isocyanates of low color number containing carbodiimide and/or uretonimine groups Grant 8,022,200 - Wershofen , et al. September 20, 2	2011-09-20
Catalyst For The Synthesis Of Alkyl Carbamates, The Method For Preparing The Same And The Use Thereof App 20110160478 - Deng; Youquan ; et al.	2011-06-30
Catalyst For The Synthesis Of Organic Carbonates, Process For Preparing The Same And Application Thereof App 20100312001 - Wershofen; Stefan ; et al.	2010-12-09
Catalyst For Producing N-substituted Carbamates, And The Preparation And Application Of The Same App 20100298592 - Wershofen; Stefan ; et al.	2010-11-25
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groups Grant 7,825,276 - Wershofen , et al. November 2, 2	2010-11-02
Method For Preparing A Carbamate, A Catalyst Applied In The Method, A Method For Preparing The Catalyst And Use Thereof App 20100274041 - Deng; Youquan ; et al.	2010-10-28
Process for controlling a production process Grant 7,813,839 - Mahrenholtz , et al. October 12, 2	2010-10-12
Process for the production of liquid, storage-stable organic isocyanates with a low colour index having carbodiimide- and/or uretone imine groups Grant 7,745,659 - Wershofen , et al. June 29, 2	2010-06-29
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groups Grant 7,714,148 - Wershofen , et al. May 11, 2	2010-05-11
Process for preparing aniline Grant 7,692,042 - Dugal , et al. April 6, 2	2010-04-06
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretonimine groups Grant 7,662,989 - Wershofen , et al. February 16, 2	2010-02-16
Process for the preparation of urethanes App 20090275771 - Jacob; Andreas ; et al.	2009-11-05
Process For Producing Diamines And Polyamines Of The Diphenylmethane Series App 20090240077 - Wershofen; Stefan ; et al.	2009-09-24
Process for removing compounds containing phenolic hydroxy groups from aromatic amines Grant 7,488,850 - Sommer , et al. February 10, 2	2009-02-10
Process for controlling a production process App 20080147208 - Mahrenholtz; Jochen ; et al.	2008-06-19
Process for removing compounds containing phenolic hydroxy groups from aromatic amines App 20080139850 - Sommer; Knut ; et al.	2008-06-12
Process for the production of light-colored isocyanates Grant 7,368,595 - Wershofen , et al. May 6, 2	2008-05-06
Process for preparing aniline App 20070238901 - Dugal; Markus ; et al.	2007-10-11
Process for preparing aniline App 20070203364 - Dugal; Markus ; et al.	2007-08-30
Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation Grant 7,253,321 - Hagen , et al. August 7, 2	2007-08-07
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretonimine groups App 20070167633 - Wershofen; Stefan ; et al.	2007-07-19
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretonimine groups App 20070155938 - Wershofen; Stefan ; et al.	2007-07-05
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groups App 20070155937 - Wershofen; Stefan ; et al.	2007-07-05
Process for the preparation of liquid, storage-stable organic isocyanates containing carbodiimide and/or uretoneimine groups App 20070155939 - Wershofen; Stefan ; et al.	2007-07-05
Process for the preparation of di- and polyamines of the diphenylmethane series Grant 7,205,439 - Hagen , et al. April 17, 2	2007-04-17
Process for the preparation of di- and polyamines of the diphenylmethane series Grant 7,186,857 - Muller , et al. March 6, 2	2007-03-06
Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation App 20060287555 - Hagen; Torsten ; et al.	2006-12-21
Process for the preparation of di- and polyamines of the diphenylmethane series App 20060224018 - Hagen; Torsten ; et al.	2006-10-05
Process for the production of liquid, storage-stable organic isocyanates with a low colour index having carbodiimide- and/or uretone imine groups App 20060128928 - Wershofen; Stefan ; et al.	2006-06-15
Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane series Grant 7,041,776 - Koch , et al. May 9, 2	2006-05-09
Process for the preparation of di- and polyamines of the diphenylmethane series App 20060094897 - Muller; Heinz-Herbert ; et al.	2006-05-04
Process for the preparation of liquid, storage-stable organic isocyanates of low color number containing carbodiimide and/or uretonimine groups App 20060025557 - Wershofen; Stefan ; et al.	2006-02-02
Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralised polyamine of the diphenylmethane series App 20040092701 - Koch, Daniel ; et al.	2004-05-13
Method for producing prepolymers containing isocyanate end groups, incorporating a small proportion of base isocyanates Grant 6,667,370 - Barnes , et al. December 23, 2	2003-12-23
Process for producing polyisocyanates of the diphenyl methane series having a reduced color value Grant 6,639,102 - Hagen , et al. October 28, 2	2003-10-28
Process For Producing Polyisocyanates Of The Diphenyl Methane Series Having A Reduced Color Value App 20030176626 - Hagen, Torsten ; et al.	2003-09-18
Process for the preparation of highly pure aromatic diurethanes and/or polyurethanes Grant 5,399,736 - Friederichs , et al. March 21, 1	1995-03-21