Inventor

Hartmut Nefzger

Inventor

Pulheim, DE

Overview

1995–2021

Patent span

Chemistry

Primary field (CPC C)

Patents· 56 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C08Gprimary

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds40%

C08JWorking-up10%

C08LCompositions of macromolecular compounds8%

Y10TTechnical subjects covered by former us classification6%

A61LMethods or apparatus for sterilising materials or objects in general5%

C09JAdhesives5%

C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients4%

B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form3%

C07CAcyclic or carbocyclic compounds3%

Y02PClimate change mitigation technologies in the production or processing of goods3%

PatentTitleYear

10,982,039PUR/PIR rigid foams made of polyaddition oligoesters2021 10,907,007Polyurethane foams based on polyethercarbonate polyols2021 10,836,858Method for producing polyether carbonate polyols2020 10,662,314Method for producing polyether carbonate polyols2020 10,633,481Polyurea systems, processes for preparing the same and use thereof for postoperative adhesion barriers2020 10,519,276Use of alcohols which contain at least two urethane groups for producing polyether carbonate polyols2019 10,487,175Use of alcohols containing at least two urethane groups for preparation of polyether polyols2019 10,253,134Rigid PUR/PIR foams of isopropylidenediphenol-based polyethers2019 10,125,217Method for producing polyether carbonate polyols2018 9,994,672Hydroxy-aminopolymers and method for producing same2018 9,957,352Use of urethane alcohols for preparing polyether carbonate polyols2018 9,920,175'Polyurethane prepreg and composite fiber element produced therefrom'2018 9,815,965'Method for producing polyether carbonate polyols'2017 9,757,492'Hydroxy amino polymer and use thereof in polyurea/polyurethane tissue adhesives'2017 9,751,279'Composite elements composed from thermoplastic polymers and polyurethanes, and process for production thereof'2017 9,733,394'Method for preparing optical lenses'2017 9,717,819'Polyurea-based fabric glue'2017 9,714,216'Use of urethane alcohols for preparation of polyether polyols'2017 9,701,805'Polyester polyols with long-chain polyether polyol building blocks and use thereof in rigid pur/pir foams'2017 9,605,106'Polyester polyols made of isophthalic acid and/or terephthalic acid and oligoalkyl oxides'2017 9,580,540'Hydroxy amino polymer and use thereof in polyurea/polyurethane tissue adhesives'2017 9,458,277'Homogeneous extruded articles made from thermoplastically processable polyurethanes based on polyester diols formed from succinic acid and 1,3-propanediol'2016 9,415,572'Composite elements composed from thermoplastic polymers and polyurethanes, and process for production thereof'2016 9,404,026'Polyurea-based fabric glue'2016 9,354,355'Lightfast polyurethane composition'2016 9,328,196'Process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups'2016 9,238,711'Hydroxylamino polymer and method for the production thereof'2016 9,193,822'Process for producing polyester polyols having secondary OH end groups'2015 9,139,685'Process for the preparation of a polyurethane polymer with secondary hydroxyl end groups comprising polyester polyols'2015 9,062,149'High-value polyurethane elastomers and production thereof'2015 9,051,410'Polyurea-based fabric glue'2015 9,029,495'Process for producing polyether polyols having primary hydroxyl end groups'2015 9,000,089'Polyurea systems, processes for preparing the same and use thereof for postoperative adhesion barriers'2015 8,697,830'Aliphatic, sinterable, thermoplastic polyurethane molding compositions with improved blooming behavior'2014 8,592,623'Method for producing polyester polyols having low amounts of dioxane waste'2013 8,481,606'Process for the production of polyester polyols with low volumes of dioxane waste'2013 8,334,035'Polyester polyols from terephthalic acid and oligoalkylene oxides'2012 8,273,846'Polyurethane and polyurethane urea elastomers based on polycarbonate polyols'2012 8,110,704'Process for the production of stable polymers'2012 7,951,896'Process for the production of NCO prepolymers that are stable to sedimentation, and their use'2011 7,893,150'Polymer dispersions in polyester polyols'2011 7,893,189'Poly(ether-ester) polyols and processes for their production'2011 7,772,321'Polymer dispersions in polyester polyols'2010 7,763,683'Polyester polyols, a process for the production thereof and the use thereof'2010 7,687,599'Poly(ether-ester) polyols and processes for their production'2010 7,091,304'Process for cleaning production plants for polyester polyols'2006 6,977,290'Process for preparing oligomeric aliphatic diols, polycarbonatediols based thereon and prepolymers thereof'2005 6,858,699'Polyurethane elastomers and processes for their preparation and use'2005 6,541,411'Titanium/zirconium catalysts and their use to prepare esters or polyesters'2003 6,407,201'Plasticizers for bowling ball coverstocks'2002 6,140,381'Delayed action catalysts for carpet backing and air frothed foam'2000 6,020,283'Process for the production of delayed action tin catalysts'2000 6,020,386'Process for the production of hydroxyfunctional compounds from (polyurethane) polyurea waste'2000 5,770,671'Process for polymerizing isocyanates'1998 5,508,312'Process for the production of compounds containing hydroxyl groups from (polyurethane) polyurea waste materials'1996 5,476,892'Process for conditioning and stabilizing polyols'1995

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1995–2005Patents assigned to BAYER AG (10)· patent assignee history

1995–2021Based in Pulheim, DE· patent location history

1998–2000Based in New Martinsville, WV, US· patent location history

2006–2017Patents assigned to BAYER MATERIALSCIENCE AG (18)· patent assignee history

2012–2017Patents assigned to NEFZGER HARTMUT (16)· patent assignee history

2012–2017Patents assigned to BAUER ERIKA (10)· patent assignee history

2016–2021Patents assigned to COVESTRO DEUTSCHLAND AG (19)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
COVESTRO DEUTSCHLAND AG	19	2016–2021
BAYER MATERIALSCIENCE AG	18	2006–2017
NEFZGER HARTMUTself	16	2012–2017
BAUER ERIKA	10	2012–2017
BAYER AG	10	1995–2005

Locations

Location	Patents	Span
Pulheim, DE	53	1995–2021
New Martinsville, WV, US	3	1998–2000