C01B 21/48
Methods for the preparation of nitrates in general
Official title: Methods for the preparation of nitrates in general (particular individual nitrates, see the relevant groups of subclasses C01B - C01G, according to the cation)
C01B21/48 (Methods for the preparation of nitrates in general) appears on 29 US grants and 29 published applications in this corpus.
Search patents in C01B- Granted patents
- 29
- Published applications
- 29
- Assignees
- 26
- Inventors
- 86
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 4 | 4 |
| 2010 | 1 | 2 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 2 | 3 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 2 |
| 2021 | 2 | 1 |
| 2022 | 2 | 0 |
| 2023 | 2 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods for oxidizing a nitrogen oxide to nitrate25 Aug 2026US 12,715,770 B2University of Miami
- Utilization of nitrogen oxides from ambient air28 Nov 2023US 11,826,693 B2Audi AG
- Ozone-mediated synthesis of nanostructures14 Feb 2023US 11,577,956 B2NUtech Ventures
- Nitrate process for manufacturing transition metal hydroxide precursors2 Aug 2022US 11,401,167 B2Umicore AG & Co. KG
- Process for preparing an iron-chromium catalyst with a platinum promoter, and catalyst consisting of iron chromium with a platinum promoter8 Feb 2022US 11,241,683 B2Petroleo Brasileiro S.A. - Petrobras
- Neutralisation reactor and method of operating thereof23 Jul 2026US 2026/0209055 A1Yara International Asa
- Ammonia generator using plasma1 Aug 2024US 2024/0254635 A1Korea Institute of Machinery & Materials
- Methods for Oxidizing a Nitrogen Oxide to Nitrate13 Jun 2024US 2024/0190706 A1University of Miami
- Utilization of nitrogen oxides from ambient air19 Aug 2021US 2021/0252449 A1Audi AG
- Utilization of pollutants from internal combustion engines25 Jun 2020US 2020/0198970 A1Audi AG
Most cited
By later US patents
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Catalyst manufacturing method31US 9,278,338 B2Johnson Matthey PLC · 2016
- Catalyst manufacturing method24US 9,272,264 B2Johnson Matthey PLC · 2016
- Low-melting point inorganic nitrate salt heat transfer fluid20US 7,588,694 B1Sandia Corporation · 2009
- Selective removal of nitrate ions from salt solutions16US 4,872,989 ARohm and Haas Company · 1989