B01D 2257/102
Nitrogen
B01D2257/102 (Nitrogen) appears on 1,334 US grants and 1,329 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,334
- Published applications
- 1,329
- Assignees
- 613
- Inventors
- 2,802
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 7 | 0 |
| 1980 | 9 | 0 |
| 1981 | 4 | 0 |
| 1982 | 9 | 0 |
| 1983 | 7 | 0 |
| 1984 | 10 | 0 |
| 1985 | 16 | 0 |
| 1986 | 8 | 0 |
| 1987 | 14 | 0 |
| 1988 | 15 | 0 |
| 1989 | 11 | 0 |
| 1990 | 25 | 0 |
| 1991 | 11 | 0 |
| 1992 | 26 | 0 |
| 1993 | 16 | 0 |
| 1994 | 10 | 0 |
| 1995 | 15 | 0 |
| 1996 | 25 | 0 |
| 1997 | 17 | 0 |
| 1998 | 12 | 0 |
| 1999 | 33 | 0 |
| 2000 | 27 | 0 |
| 2001 | 18 | 4 |
| 2002 | 42 | 26 |
| 2003 | 40 | 22 |
| 2004 | 16 | 18 |
| 2005 | 15 | 35 |
| 2006 | 17 | 35 |
| 2007 | 20 | 29 |
| 2008 | 22 | 31 |
| 2009 | 14 | 47 |
| 2010 | 29 | 40 |
| 2011 | 25 | 40 |
| 2012 | 25 | 56 |
| 2013 | 52 | 49 |
| 2014 | 49 | 51 |
| 2015 | 38 | 53 |
| 2016 | 35 | 69 |
| 2017 | 55 | 66 |
| 2018 | 57 | 85 |
| 2019 | 57 | 49 |
| 2020 | 65 | 83 |
| 2021 | 42 | 81 |
| 2022 | 65 | 84 |
| 2023 | 53 | 61 |
| 2024 | 55 | 83 |
| 2025 | 55 | 74 |
| 2026 | 29 | 58 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Analysis device and analysis method for quality index of natural gas product and application6 Oct 2026US 12,754,171 B2PetroChina Company Limited
- Analysis system and method for impurity components in perfluoropropane22 Sep 2026US 12,742,752 B2Lansis Instrument (Shanghai) Co., Ltd
- Adsorbent material, adsorption system, and adsorption process for hydrogen recovery8 Sep 2026US 12,729,116 B2Air Products and Chemicals, Inc.
- Arrangement handling purged alcohol-based fuel and a method thereof8 Sep 2026US 12,729,853 B2Alfa Laval Corporate AB
- Compact portable oxygen concentrator18 Aug 2026US 12,710,121 B2Inogen, Inc.
- 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
- Purge device and production method for separation membrane1 Oct 2026US 2026/0295514 A1Mitsubishi Heavy Industries, Ltd.
- Hollow fiber membranes comprising a poly(aryl ether sulfone) and a water-soluble polymer additive1 Oct 2026US 2026/0295540 A1BASF SE
- Adsorbent Material, Adsorption System, and Adsorption Process For Hydrogen Recovery17 Sep 2026US 2026/0274664 A1Air Products and Chemicals, Inc.
- Building Emission Processing and/or Sequestration Systems and Methods10 Sep 2026US 2026/0266457 A1Carbonquest, Inc.
Most cited
By later US patents
- Portable oxygen concentration system and method of using the same310US 6,651,658 B1SeQual Technologies, Inc. · 2003
- Portable oxygen concentration system and method of using the same223US 6,691,702 B2SeQual Technologies, Inc. · 2004
- High frequency pressure swing adsorption186US 6,176,897 B1Questor Industries Inc. · 2001
- Portable oxygen concentration system and method of using the same182US 6,629,525 B2SeQual Technologies, Inc. · 2003
- Rotary pressure swing adsorption apparatus181US 6,406,523 B1QuestAir Technologies Inc. · 2002