B01D 2251/202
Hydrogen
B01D2251/202 (Hydrogen) appears on 163 US grants and 241 published applications in this corpus.
Search patents in B01D- Granted patents
- 163
- Published applications
- 241
- Assignees
- 172
- Inventors
- 643
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 2 |
| 2004 | 3 | 4 |
| 2005 | 1 | 6 |
| 2006 | 3 | 4 |
| 2007 | 2 | 10 |
| 2008 | 4 | 14 |
| 2009 | 4 | 11 |
| 2010 | 10 | 25 |
| 2011 | 10 | 10 |
| 2012 | 13 | 6 |
| 2013 | 10 | 11 |
| 2014 | 10 | 7 |
| 2015 | 4 | 10 |
| 2016 | 5 | 5 |
| 2017 | 6 | 10 |
| 2018 | 5 | 9 |
| 2019 | 4 | 7 |
| 2020 | 9 | 14 |
| 2021 | 10 | 6 |
| 2022 | 6 | 8 |
| 2023 | 3 | 14 |
| 2024 | 10 | 12 |
| 2025 | 9 | 20 |
| 2026 | 6 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Performance enhancement of a platinum-containing catalyst via exhaust gas hydrogen enrichment16 Jun 2026US 12,654,160 B2BASF Mobile Emissions Catalysts LLC
- Method for reducing risk of burning and explosion in deoxygenation process of oxygen-containing gas21 Apr 2026US 12,606,505 B2China Petroleum & Chemical Corporation
- Gas production apparatus, gas production system, steel production system, chemical manufacturing system, and gas production method with reduced carbon dioxide emission24 Mar 2026US 12,582,941 B2Sekisui Chemical Co., Ltd.
- Fired equipment exhaust recovery system27 Jan 2026US 12,533,633 B2Saudi Arabian Oil Company
- Hydrogen oxidation catalysts for hydrogen-internal combustion engine systems13 Jan 2026US 12,523,169 B2BASF Mobile Emissions Catalysts LLC
- Catalytic reactor and system for purification of carbon dioxide streams and methods of using the same8 Oct 2026US 2026/0307007 A1Oxy Low Carbon Ventures, LLC
- Heat pump system and method for manufacturing heat pump device20 Aug 2026US 2026/0243471 A1Mitsubishi Electric Corporation
- Gas treatment method and gas treatment device13 Aug 2026US 2026/0233154 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Reducing the content of nox and n2o in the offgas from firing plants operated with nh3 for catalytic decomposition of nh330 Jul 2026US 2026/0216648 A1
- Reduction of nox and n2o in the exhaust gas of ship motors operated using nh330 Jul 2026US 2026/0216649 A1
Most cited
By later US patents
- Method and apparatus for reducing nitrogen oxides from internal combustion engine207US 5,272,871 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1993
- NOx decreasing apparatus for an internal combustion engine153US 5,412,946 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1995
- Diagnostics and control of an on board hydrogen generation and delivery system93US 5,964,089 ALynntech, Inc. · 1999
- Thermally regenerable nitric oxide adsorbent90US 8,105,559 B2Johnson Matthey Public Limited Company · 2012
- Catalytic EGR oxidizer for IC engines and gas turbines86US 8,061,120 B22011