C01B 21/50
Nitrous acid
Official title: Nitrous acid; Salts thereof
C01B21/50 (Nitrous acid) appears on 52 US grants and 50 published applications in this corpus.
Search patents in C01B- Granted patents
- 52
- Published applications
- 50
- Assignees
- 39
- Inventors
- 95
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 2 |
| 2015 | 1 | 4 |
| 2016 | 3 | 5 |
| 2017 | 4 | 2 |
| 2018 | 1 | 4 |
| 2019 | 3 | 2 |
| 2020 | 1 | 3 |
| 2021 | 3 | 2 |
| 2022 | 1 | 6 |
| 2023 | 1 | 2 |
| 2024 | 4 | 4 |
| 2025 | 2 | 5 |
| 2026 | 3 | 3 |
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
- Free flowing sodium nitrite and method of production18 Aug 2026US 12,709,542 B2Deepak Nitrite Limited
- Apparatus and process for conversion of ammonia into oxides of nitrogen3 Mar 2026US 12,565,427 B2Deepak Nitrite Limited
- Nitrogenous gas sustained releasing agent and nitrogenous gas sustained releaser composed of the same as well as nitrogenous gas sustained releasing method, respiratory equipment, package, and sustained releasing apparatus using the sustained releaser8 Apr 2025US 12,268,709 B2National Institute for Materials Science
- Sodium nitrite-containing pharmaceutical compositions7 Jan 2025US 12,186,337 B2Hope Medical Enterprises, Inc.
- Free-flowing food grade sodium nitrite and production method thereof20 Aug 2026US 2026/0242222 A1Deepak Nitrite Limited
- Sodium nitrite-containing pharmaceutical compositions25 Jun 2026US 2026/0174795 A1Hope Medical Enterprises, Inc. dba Hope Pharmaceuticals
- Free flowing sodium nitrite and method of production30 Apr 2026US 2026/0116754 A1Deepak Nitrite Limited
- Comproportionation-based autocatalytic cycles and related methods18 Dec 2025US 2025/0382173 A1Wisconsin Alumni Research Foundation
- Plasma Process for Nitrate Production9 Oct 2025US 2025/0313469 A1US Plasma Engineering LLC
Most cited
By later US patents
- Sodium nitrite-containing pharmaceutical compositions34US 8,568,793 B2Hope Medical Enterprises, Inc. · 2013
- Process for recovering sodium nitrite31US 6,251,354 B1General Electric Company · 2001
- Recovery of sodium nitrite from by-product process liquors containing sodium chloride30US 3,965,247 AAllied Chemical Corporation · 1976
- Process for the recovery of sodium nitrite27US 6,855,306 B2General Chemical Performance Products LLC · 2005
- Sodium nitrite-containing pharmaceutical compositions20US 9,687,506 B2Hope Medical Enterprises, Inc. · 2017