C01B 21/38
Nitric acid
C01B21/38 (Nitric acid) appears on 154 US grants and 156 published applications in this corpus.
Search patents in C01B- Granted patents
- 154
- Published applications
- 156
- Assignees
- 140
- Inventors
- 425
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 2 |
| 2003 | 1 | 2 |
| 2004 | 2 | 1 |
| 2005 | 1 | 3 |
| 2006 | 1 | 1 |
| 2007 | 2 | 0 |
| 2008 | 2 | 3 |
| 2009 | 2 | 1 |
| 2010 | 1 | 3 |
| 2011 | 2 | 2 |
| 2012 | 2 | 10 |
| 2013 | 0 | 6 |
| 2014 | 4 | 7 |
| 2015 | 5 | 4 |
| 2016 | 3 | 4 |
| 2017 | 7 | 5 |
| 2018 | 0 | 9 |
| 2019 | 3 | 9 |
| 2020 | 4 | 8 |
| 2021 | 11 | 6 |
| 2022 | 5 | 12 |
| 2023 | 6 | 16 |
| 2024 | 6 | 17 |
| 2025 | 8 | 13 |
| 2026 | 6 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for the synthesis of nitrogen oxides and nitric acid in a thermal reactor25 Aug 2026US 12,715,769 B2Nitrocapt AB
- Knitting of noble metal nets using ignoble materials at the edge, noble metal net produced in this way and a method for using the noble metal net11 Aug 2026US 12,702,972 B2Umicore AG & Co. KG
- 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
- Process and plant for preparing nitric acid10 Mar 2026US 12,570,532 B2thyssenkrupp AG
- Catalyst system for a flow reactor, and method for the catalytic oxidation of ammonia2 Jul 2026US 2026/0183751 A1Heraeus Precious Metals GmbH & Co. KG
- Method for the Synthesis of Nitrogen Oxides and Nitric Acid in a Thermal Reactor21 May 2026US 2026/0143165 A2Nitrocapt AB
- Method for reducing nox in a nitric acid plant during transitory events26 Mar 2026US 2026/0084110 A1Casale SA
- Process and system for lithium production12 Mar 2026US 2026/0070800 A1Icsip Pty Ltd
- Process and system for lithium production22 Jan 2026US 2026/0022023 A1Icsip Pty Ltd
Most cited
By later US patents
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Membrane solvent extraction82US 3,956,112 AAllied Chemical Corporation · 1976
- Barrier discharge conversion of Hg, SO.sub.2 and NOx79US 6,117,403 AZero Emissions Technology Inc. · 2000
- Barrier discharge conversion of SO.sub.2 and NOx to acids78US 6,132,692 APowerspan Corp. · 2000
- Barrier discharge conversion of SO.sub.2 and NOx to acids69US 5,871,703 AZero Emissions Technology Inc. · 1999