B01D 2252/20447
Containing a piperazine-ring
Official title: containing a piperazine-ring
B01D2252/20447 (Containing a piperazine-ring) appears on 128 US grants and 197 published applications in this corpus.
Search patents in B01D- Granted patents
- 128
- Published applications
- 197
- Assignees
- 96
- Inventors
- 446
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 0 | 6 |
| 2011 | 1 | 7 |
| 2012 | 3 | 13 |
| 2013 | 10 | 17 |
| 2014 | 9 | 10 |
| 2015 | 1 | 13 |
| 2016 | 7 | 16 |
| 2017 | 7 | 14 |
| 2018 | 17 | 9 |
| 2019 | 10 | 12 |
| 2020 | 7 | 13 |
| 2021 | 16 | 16 |
| 2022 | 9 | 7 |
| 2023 | 5 | 11 |
| 2024 | 15 | 10 |
| 2025 | 6 | 9 |
| 2026 | 4 | 12 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Solvent systems for carbon dioxide capture and methods of making and using said systems14 Jul 2026US 12,678,729 B2Schlumberger Technology Corporation
- Composition for carbon dioxide separation and method for separating carbon dioxide9 Jun 2026US 12,649,145 B2Tosoh Corporation
- Method for upgrading bio-based material and upgraded material26 May 2026US 12,637,623 B2Neste Oyj
- System for offshore carbon dioxide capture5 May 2026US 12,616,929 B2Equinor Energy AS
- Compositions and methods for carbon dioxide capture4 Nov 2025US 12,458,920 B2The Board of Trustees of the University of Illinois
- Absorbent for Capturing Carbon Dioxide8 Oct 2026US 2026/0307000 A1Panasia Co., Ltd.
- Composite amine absorption liquid1 Oct 2026US 2026/0295512 A1Mitsubishi Heavy Industries, Ltd.
- A method and system for the removal of carbon dioxide from carbon capture solvents using heat from a gas24 Sep 2026US 2026/0284577 A1
- Acid gas removal apparatus and acid gas removal method24 Sep 2026US 2026/0284580 A1Kabushiki Kaisha Toshiba
- Composition for carbon dioxide separation and method for separating carbon dioxide17 Sep 2026US 2026/0273505 A1Tosoh Corporation
Most cited
By later US patents
- Gas liquid contactor and effluent cleaning system and method27US 7,866,638 B2Neumann Systems Group, Inc. · 2011
- Process for the recovery of carbon dioxide from a gas stream25US 7,601,315 B2Cansolv Technologies Inc. · 2009
- Gas liquid contactor and effluent cleaning system and method14US 8,336,863 B2Neumann Systems Group, Inc. · 2012
- Gas purification configurations and methods14US 8,876,951 B2Fluor Technologies Corporation · 2014
- Capture of carbon dioxide by hybrid sorption13US 8,840,706 B12014