B01D 2252/20426
Secondary amines
B01D2252/20426 (Secondary amines) appears on 173 US grants and 272 published applications in this corpus.
Search patents in B01D- Granted patents
- 173
- Published applications
- 272
- Assignees
- 128
- Inventors
- 551
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 7 |
| 2012 | 2 | 23 |
| 2013 | 13 | 26 |
| 2014 | 10 | 16 |
| 2015 | 8 | 20 |
| 2016 | 17 | 27 |
| 2017 | 16 | 21 |
| 2018 | 17 | 17 |
| 2019 | 16 | 21 |
| 2020 | 16 | 13 |
| 2021 | 11 | 12 |
| 2022 | 17 | 16 |
| 2023 | 11 | 15 |
| 2024 | 7 | 12 |
| 2025 | 9 | 10 |
| 2026 | 2 | 11 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Low-cost and high-efficiency absorption-desorption decoupling method for contaminant-CO2 synergistic capture27 Jan 2026US 12,533,627 B2Jiaxing Research Institute, Zhejiang University
- Hygroscopic hydrogels, methods and uses thereof for water collection20 Jan 2026US 12,528,766 B2University of Prince Edward Island
- Methods and compositions for carbon capture30 Dec 2025US 12,508,536 B2Entropy Inc.
- Systems for removing carbon dioxide from a carbon dioxide containing gas, and related methods25 Nov 2025US 12,478,918 B1Schlumberger Technology Corporation
- Compositions and methods for carbon dioxide capture4 Nov 2025US 12,458,920 B2The Board of Trustees of the University of Illinois
- Hydrophobic acidic gas absorbents20 Aug 2026US 2026/0241369 A1
- Integrated process for removing carbon dioxide from a ship or offshore floating vessel using a rotating packed device20 Aug 2026US 2026/0243184 A1Chevron U.S.A.Inc.
- Alkoxylated polyalkyleneimines, preparation and use6 Aug 2026US 2026/0226235 A1BASF SE
- Non-aqueous solvent formulations for acid gas capture18 Jun 2026US 2026/0166475 A1Research Triangle Institute
- Atmospheric carbon dioxide capture system28 May 2026US 2026/0145123 A1Robert Bosch GmbH
Most cited
By later US patents
- Carbon dioxide sorbents39US 8,470,074 B2ExxonMobil Research and Engineering Company · 2013
- Carbon dioxide sorbents28US 8,598,071 B1ExxonMobil Research and Engineering Company · 2013
- Carbon dioxide sorbents20US 8,598,070 B1ExxonMobil Research and Engineering Company · 2013
- CO2 absorption from gas mixtures using an aqueous solution of 4-amino-2,2,6,6-tetramethylpiperidine15US 8,500,892 B2Evonik Degussa GmbH · 2013
- Separations with ionic liquid solvents14US 9,238,193 B2Chevron Phillips Chemical Company LP · 2016