B01D 2252/20436
Cyclic amines
B01D2252/20436 (Cyclic amines) appears on 299 US grants and 431 published applications in this corpus.
Search patents in B01D- Granted patents
- 299
- Published applications
- 431
- Assignees
- 187
- Inventors
- 858
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 0 | 6 |
| 2011 | 1 | 12 |
| 2012 | 3 | 33 |
| 2013 | 20 | 29 |
| 2014 | 21 | 23 |
| 2015 | 14 | 25 |
| 2016 | 21 | 39 |
| 2017 | 19 | 34 |
| 2018 | 34 | 24 |
| 2019 | 24 | 32 |
| 2020 | 24 | 29 |
| 2021 | 24 | 30 |
| 2022 | 19 | 20 |
| 2023 | 21 | 28 |
| 2024 | 24 | 26 |
| 2025 | 17 | 20 |
| 2026 | 12 | 19 |
By publication year. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 2252/20447Containing a piperazine-ringIndexing code128
- B01D 2252/20468Containing a pyrrolidone-ringIndexing code58
- B01D 2252/20442Containing a piperidine-ringIndexing code43
- B01D 2252/20473Containing an imidazole-ringIndexing code41
- B01D 2252/20452Containing a morpholine-ringIndexing code32
- B01D 2252/20457Containing a pyridine-ringIndexing code19
- B01D 2252/20463Containing a pyrimidine-ringIndexing code5
Recent patents
- Use of silica nanoparticles with triazine for H2S scavenging6 Oct 2026US 12,752,236 B2Nissan Chemical America Corporation
- Solvent systems for carbon dioxide capture and methods of making and using said systems14 Jul 2026US 12,678,729 B2Schlumberger Technology Corporation
- Use of melamine cyanurate nanoparticles and silica nanoparticles for H2S scavenging23 Jun 2026US 12,661,615 B2Nissan Chemical America Corporation
- Composition for carbon dioxide separation and method for separating carbon dioxide9 Jun 2026US 12,649,145 B2Tosoh Corporation
- Use of amine modified nanoparticles for H2S scavenging2 Jun 2026US 12,643,802 B2Nissan Chemical America Corporation
- 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
- Carbon dioxide absorbent and carbon dioxide separation device24 Sep 2026US 2026/0284584 A1Kabushiki Kaisha Toshiba
Most cited
By later US patents
- Rapid temperature swing adsorption contactors for gas separation56US 8,673,059 B2ExxonMobil Research and Engineering Company · 2014
- Temperature swing adsorption process for the separation of target species from a gas mixture52US 8,784,533 B2ExxonMobil Research and Engineering Company · 2014
- Pressure-temperature swing adsorption process51US 8,784,534 B2ExxonMobil Research and Engineering Company · 2014
- Pressure-temperature swing adsorption process for the separation of heavy hydrocarbons from natural gas streams50US 8,784,535 B2ExxonMobil Research and Engineering Company · 2014
- Swing adsorption processes utilizing controlled adsorption fronts50US 8,858,683 B2ExxonMobil Research and Engineering Company · 2014