B01D 2252/20468
Containing a pyrrolidone-ring
Official title: containing a pyrrolidone-ring
B01D2252/20468 (Containing a pyrrolidone-ring) appears on 58 US grants and 74 published applications in this corpus.
Search patents in B01D- Granted patents
- 58
- Published applications
- 74
- Assignees
- 41
- Inventors
- 134
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2011 | 0 | 1 |
| 2012 | 0 | 5 |
| 2013 | 1 | 3 |
| 2014 | 3 | 2 |
| 2015 | 7 | 6 |
| 2016 | 6 | 9 |
| 2017 | 5 | 3 |
| 2018 | 4 | 5 |
| 2019 | 3 | 3 |
| 2020 | 4 | 8 |
| 2021 | 3 | 9 |
| 2022 | 6 | 6 |
| 2023 | 8 | 4 |
| 2024 | 3 | 4 |
| 2025 | 3 | 4 |
| 2026 | 2 | 2 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Formulations and methods to remove non-acidic sulfur compounds from gas streams26 May 2026US 12,637,627 B2Baker Hughes Oilfield Operations LLC
- Method for reducing methane emissions from biogas upgrading17 Feb 2026US 12,551,841 B2Airco Process Technology A/S
- Process and plant for removing carbon dioxide from synthesis gas23 Dec 2025US 12,502,638 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Acid gas scrubbing methods featuring amine phase separation for hydrogen sulfide capture10 Jun 2025US 12,325,004 B2ExxonMobil Technology and Engineering Company
- Systems and methods for processing gases4 Feb 2025US 12,215,026 B2Transform Materials LLC
- Non-Triazine Based Scavengers30 Apr 2026US 2026/0115648 A1ChampionX LLC
- Electrochemical systems for capture of acid gases12 Feb 2026US 2026/0042063 A1
- Acid Gas Scrubbing Methods Featuring Amine Phase Separation for Hydrogen Sulfide Capture6 Nov 2025US 2025/0339809 A1ExxonMobil Technology and Engineering Company
- Formulations and methods to remove non-acidic sulfur compounds from gas streams10 Apr 2025US 2025/0115816 A1Baker Hughes Oilfield Operations LLC
- Carbon Dioxide Absorbing Composition, Method of Absorbing Carbon Dioxide and Method of Separating Carbon Dioxide Using the Same13 Mar 2025US 2025/0083125 A1SK Innovation Co., Ltd.
Most cited
By later US patents
- Integrated process for CO2 capture and use in thermal power production cycle21US 9,598,993 B2Saudi Arabian Oil Company · 2017
- Configurations and methods for processing high pressure acid gases with zero emissions15US 9,902,914 B2Fluor Technologies Corporation · 2018
- Gas purification configurations and methods14US 8,876,951 B2Fluor Technologies Corporation · 2014
- Component separations in polymerization11US 9,598,514 B2Chevron Phillips Chemical Company LP · 2017
- Configurations and methods of flexible CO2 removal8US 10,000,713 B2Fluor Technologies Corporation · 2018