C01B 21/22
Nitrous oxide
Official title: Nitrous oxide (N2O) {(C01B21/203 takes precedence)}
C01B21/22 (Nitrous oxide) appears on 49 US grants and 30 published applications in this corpus.
Search patents in C01B- Granted patents
- 49
- Published applications
- 30
- Assignees
- 42
- Inventors
- 137
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 3 | 5 |
| 2011 | 0 | 3 |
| 2012 | 1 | 4 |
| 2013 | 4 | 2 |
| 2014 | 1 | 2 |
| 2015 | 3 | 0 |
| 2016 | 1 | 0 |
| 2017 | 2 | 2 |
| 2018 | 0 | 2 |
| 2019 | 2 | 0 |
| 2020 | 0 | 0 |
| 2021 | 2 | 1 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process and reactor for catalytic oxidation of ammonia4 Nov 2025US 12,459,819 B2Casale SA
- Transient N2O decomposition process and reactor10 Sep 2024US 12,084,343 B1Reaction Systems, LLC
- Nitrite eluting devices and methods of use thereof16 Nov 2021US 11,173,235 B2Cook Regentec LLC
- Process for the manufacture of a frozen product2 Mar 2021US 10,932,479 B2Conopeo, Inc.
- Process for recovery and purification of nitrous oxide5 Nov 2019US 10,464,813 B2Versum Materials US, LLC
- Catalyst for removing nitrous oxide and method of removing nitrous oxide23 Apr 2026US 2026/0108867 A1Industrial Technology Research Institute
- Gas processing apparatus using catalyst30 Oct 2025US 2025/0332542 A1Ennopia
- Catalyst system for removing perfluorinated compounds and nitrous oxide30 Oct 2025US 2025/0332574 A1Ennopia
- Antiviral that destroys dna and/or rna of viruses and viroids29 Dec 2022US 2022/0409829 A1
- Process and reactor for catalytic oxidation of ammonia20 Oct 2022US 2022/0332581 A1Casale SA
Most cited
By later US patents
- Energy-activated compositions for controlled sustained release of a gas46US 7,273,567 B1Microactive Corp. · 2007
- Process for upgrading natural gas31US 6,002,059 AMobil Oil Corporation · 1999
- Process for preparing a gasified ice product29US 4,487,023 AGeneral Foods Corporation · 1984
- Nitrous oxide purification by pressure swing adsorption25US 6,080,226 AUop LLC · 2000
- Nitrous oxide purification system and process24US 6,387,161 B1American Air Liquide, Inc. · 2002