C01B 21/40
Preparation by absorption of oxides of nitrogen
Official title: Preparation by absorption of oxides of nitrogen {(C01B21/26 takes precedence)}
C01B21/40 (Preparation by absorption of oxides of nitrogen) appears on 54 US grants and 65 published applications in this corpus.
Search patents in C01B- Granted patents
- 54
- Published applications
- 65
- Assignees
- 53
- Inventors
- 160
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 4 |
| 2013 | 0 | 4 |
| 2014 | 3 | 3 |
| 2015 | 2 | 2 |
| 2016 | 1 | 0 |
| 2017 | 3 | 2 |
| 2018 | 0 | 3 |
| 2019 | 1 | 4 |
| 2020 | 3 | 4 |
| 2021 | 5 | 5 |
| 2022 | 2 | 4 |
| 2023 | 3 | 9 |
| 2024 | 1 | 5 |
| 2025 | 5 | 6 |
| 2026 | 3 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for the synthesis of nitrogen oxides and nitric acid in a thermal reactor25 Aug 2026US 12,715,769 B2Nitrocapt AB
- Absorption column comprising a feed box having a serrated weir and a structured packing and process for the production of nitric acid28 Jul 2026US 12,692,156 B2Yara International Asa
- Dual pressure plant for the production of nitric acid and method for operating same30 Jun 2026US 12,668,489 B2Yara International Asa
- Method for operating an SOFC for the combined production of electricity and nitric oxide30 Dec 2025US 12,512,498 B2Yara International Asa
- Process and reactor for catalytic oxidation of ammonia4 Nov 2025US 12,459,819 B2Casale SA
- Method for the Synthesis of Nitrogen Oxides and Nitric Acid in a Thermal Reactor21 May 2026US 2026/0143165 A2Nitrocapt AB
- Production of lithium chemicals and metallic lithium8 Jan 2026US 2026/0008682 A1Icsip Pty Ltd
- Production of lithium chemicals and metallic lithium8 Jan 2026US 2026/0008683 A1Icsip Pty Ltd
- Production of lithium chemicals and metallic lithium8 Jan 2026US 2026/0008684 A1Icsip Pty Ltd
- Production of lithium chemicals and metallic lithium8 Jan 2026US 2026/0008685 A1Icsip Pty Ltd
Most cited
By later US patents
- Hydrogen peroxide for flue gas desulfurization46US 5,674,459 AThe Babcock & Wilcox Company · 1997
- Multiple oxidation nitrogen fixation38US 4,705,670 A1987
- Production of chemical compounds29US 9,084,978 B22015
- Process for simultaneous removal of SO.sub.2 and NO.sub.x from gas streams24US 4,640,825 ABattelle Memorial Institute · 1987
- Water-powdered piezoelectric unit for producing nitrogen fertilizer19US 4,915,915 A1990