Method for the purification of aniline
US-2025206694-A1 · Jun 26, 2025 · US
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Steffens Friedhelm patents
Steffens Friedhelm is listed as an inventor on 46 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Steffens Friedhelm |
| Total patents | 46 |
| First publication | May 5, 2015 |
| Latest publication | Jun 26, 2025 |
Notable patents
Publications ranked by popularity score, then publication date.
Method for recovering raw materials from polyurethane products
US-12187858-B2 · Jan 7, 2025 · US
Obtaining Aliphatic Amines from Compositions
US-2024343674-A1 · Oct 17, 2024 · US
Method for the Removal of Water from and Transport of Aliphatic Diamines
US-2024336554-A1 · Oct 10, 2024 · US
Process for recovering raw materials from polyurethane foams
US-2024101783-A1 · Mar 28, 2024 · US
Method for recovering raw materials from polyurethane products
US-2023357532-A1 · Nov 9, 2023 · US
Method for the purification of aniline
US-2022348533-A1 · Nov 3, 2022 · US
Method for recovering raw materials from polyurethane products
US-2022251328-A1 · Aug 11, 2022 · US
Method and a system for separating and treating impurities from a hydrogen chloride liquid mixture
US-11267703-B2 · Mar 8, 2022 · US
Distributor device, in particular for falling film evaporators, and use thereof
US-10894222-B2 · Jan 19, 2021 · US
Recent patents
Latest publications not already listed above.
Aniline purification process
US-10889539-B2 · Jan 12, 2021 · US
Method for producing TDI-trimerisates with high purity
US-10676448-B2 · Jun 9, 2020 · US
Aniline purification process
US-2020123097-A1 · Apr 23, 2020 · US
Distillation column and use thereof for cleaning isocyanates
US-10576392-B2 · Mar 3, 2020 · US
Distributor device, in particular for falling film evaporators, and use thereof
US-2020030712-A1 · Jan 30, 2020 · US
Method for producing isocyanates
US-10435353-B2 · Oct 8, 2019 · US
A method and a system for separating and treating impurities from a hydrogen chloride liquid mixture
US-2019194018-A1 · Jun 27, 2019 · US
Method for producing isocyanates
US-10239826-B2 · Mar 26, 2019 · US
Method for producing tdi-trimerisates with high purity
US-2019031625-A1 · Jan 31, 2019 · US
Method for producing light-coloured TDI-polyisocyanates
US-10189945-B2 · Jan 29, 2019 · US
Method for producing isocyanates
US-2018370907-A1 · Dec 27, 2018 · US
Method for dividing fluid streams
US-10143987-B2 · Dec 4, 2018 · US
Method for producing TDI-trimerisates with high purity
US-10131641-B2 · Nov 20, 2018 · US
Distillation column and use thereof for cleaning isocyanates
US-2018318728-A1 · Nov 8, 2018 · US
Method for producing isocyanates
US-2018194720-A1 · Jul 12, 2018 · US
Process for purifying raw-material gases by fractionation
US-2018186633-A1 · Jul 5, 2018 · US
Process for purifying raw-material gases by fractionation
US-10011484-B1 · Jul 3, 2018 · US
Process for purifying raw-material gases by fractionation
US-9938147-B2 · Apr 10, 2018 · US
Process for separating an isocyanate prepared by phosgenation of a primary amine in the gas phase from the gaseous crude product of the phosgenation
US-9932299-B2 · Apr 3, 2018 · US
Process for operating a gas phase phosgenation plant
US-9845286-B2 · Dec 19, 2017 · US
Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| Covestro Deutschland Ag | 39 |
| Bayer Materialscience Ag | 9 |
| Covestro Intellectual Property Gmbh & Co Kg | 3 |
| Steffens Friedhelm | 3 |
| Bayer Materialscience Llc | 2 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| C07C263/10 | 18 |
| C07C263/20 | 18 |
| C07C265/14 | 17 |
| C07C209/84 | 6 |
| C08G18/42 | 6 |