C01B 21/28
Apparatus
C01B21/28 (Apparatus) appears on 55 US grants and 68 published applications in this corpus.
Search patents in C01B- Granted patents
- 55
- Published applications
- 68
- Assignees
- 34
- Inventors
- 130
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 3 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 2 |
| 2012 | 1 | 3 |
| 2013 | 3 | 3 |
| 2014 | 1 | 2 |
| 2015 | 1 | 3 |
| 2016 | 3 | 2 |
| 2017 | 3 | 3 |
| 2018 | 2 | 3 |
| 2019 | 4 | 3 |
| 2020 | 2 | 5 |
| 2021 | 2 | 3 |
| 2022 | 3 | 6 |
| 2023 | 5 | 7 |
| 2024 | 3 | 8 |
| 2025 | 3 | 6 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process and plant for preparing nitric acid10 Mar 2026US 12,570,532 B2thyssenkrupp AG
- Apparatus and process for conversion of ammonia into oxides of nitrogen3 Mar 2026US 12,565,427 B2Deepak Nitrite Limited
- Reactor for the catalytic treatment of a gas stream24 Feb 2026US 12,558,660 B2thyssenkrupp AG
- Nitric oxide generation process controls30 Dec 2025US 12,509,349 B2Third Pole, Inc.
- Process and reactor for catalytic oxidation of ammonia4 Nov 2025US 12,459,819 B2Casale SA
- Apparatus for production of ammonium nitrate from nitric acid and ammonia13 Aug 2026US 2026/0233190 A1thyssenkrupp AG
- Nitric oxide generation process controls13 Aug 2026US 2026/0233997 A1Third Pole, Inc.
- Method for operating a nitric acid plant and nitric acid plant4 Dec 2025US 2025/0368511 A1thyssenkrupp AG
- Nitric acid plant and process with heat recovery system7 Aug 2025US 2025/0250168 A1Casale SA
- Nitric oxide generation systems and methods26 Jun 2025US 2025/0205673 A1Nanjing Novlead Biotechnology Co., Ltd.
Most cited
By later US patents
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Packed bed arrangement for oxidation reaction system29US 5,266,291 APraxair Technology, Inc. · 1993
- Systems and methods for performing a risk management assessment of a property27US 10,515,414 B2Eagle View Technologies, Inc. · 2019
- Method for forming nitric oxide from ammonia18US 4,512,964 AMassachusetts Institute of Technology · 1985
- Method and apparatus for forming nitric oxide from ammonia15US 4,272,336 AMassachusetts Institute of Technology · 1981