Inventor
Friedhelm Steffens
Inventor
Leverkusen, DE
Overview
Patents· 34 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds35%
B01DSeparation13%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry12%
C01BNon-metallic elements12%
C09DCoating compositions, e.g. paints, varnishes or lacquers6%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds4%
C09JAdhesives4%
C07DHeterocyclic compounds3%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%
B01FMixing, e.g. dissolving, emulsifying or dispersing1%
PatentTitleYear
10,894,222Distributor device, in particular for falling film evaporators, and use thereof202110,889,539Aniline purification process202110,676,448Method for producing TDI-trimerisates with high purity202010,576,392Distillation column and use thereof for cleaning isocyanates202010,435,353Method for producing isocyanates201910,239,826Method for producing isocyanates201910,189,945Method for producing light-coloured TDI-polyisocyanates201910,143,987Method for dividing fluid streams201810,131,641Method for producing TDI-trimerisates with high purity201810,011,484Process for purifying raw-material gases by fractionation20189,938,147Process for purifying raw-material gases by fractionation20189,932,299Process for separating an isocyanate prepared by phosgenation of a primary amine in the gas phase from the gaseous crude product of the phosgenation20189,845,286Process for operating a gas phase phosgenation plant20179,840,461'Method for operating a gas-phase phosgenation plant'20179,688,619'Process for obtaining organic isocyanates from distillation residues from isocyanate preparation'20179,480,958'Device and method for producing phosgene'20169,376,377'Method for producing isocyanates'20169,365,503'Process for the preparation of isocyanates in the gas phase'20169,029,595'Method for working up distillation residues from isocyanate production'20159,024,057'Process for the preparation of isocyanates in the gas phase'20158,563,768'Process for the preparation of isocyanates'20138,399,702'Process for the production of aromatic diisocyanates in the gas'20138,063,241'Process for the preparation of toluene-diisocyanate'20118,030,522'Process for the production of toluene diisocyanate'20117,645,900'Process for the preparation of isocyanates'20107,615,662'Process for the preparation of isocyanates in the gas phase'20097,575,660'Process for the distillative separation of aqueous amine solutions'20097,555,917'Process for purification of anhydrous hydrogen chloride gas'20097,541,487'Process for the preparation of isocyanates in the gas phase'20097,511,176'Process for the preparation of toluenediamines by catalytic hydrogenation of dinitrotoluenes'20097,322,565'Stirring device and process for carrying out a gas-liquid reaction'20087,118,653'Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column'20066,719,957'Process for purification of anhydrous hydrogen chloride gas'20044,732,685'Method of liquid-liquid extraction using material exchange columns'1988Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1988–2021Based in Leverkusen, DE· patent location history
2008–2018Patents assigned to BAYER MATERIALSCIENCE AG (16)· patent assignee history
2011–2018Patents assigned to STEFFENS FRIEDHELM (6)· patent assignee history
2011–2016Patents assigned to LORENZ WOLFGANG (4)· patent assignee history
2013–2016Patents assigned to BRUNS RAINER (4)· patent assignee history
2016–2021Patents assigned to COVESTRO DEUTSCHLAND AG (18)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| COVESTRO DEUTSCHLAND AG | 18 | 2016–2021 |
| BAYER MATERIALSCIENCE AG | 16 | 2008–2018 |
| STEFFENS FRIEDHELMself | 6 | 2011–2018 |
| BRUNS RAINER | 4 | 2013–2016 |
| LORENZ WOLFGANG | 4 | 2011–2016 |
Locations
| Location | Patents | Span |
|---|---|---|
| Leverkusen, DE | 34 | 1988–2021 |