C01C 1/02
Preparation, purification or separation of ammonia
Official title: Preparation, {purification} or separation of ammonia
C01C1/02 (Preparation, purification or separation of ammonia) appears on 1,139 US grants and 1,215 published applications in this corpus.
Search patents in C01C- Granted patents
- 1,139
- Published applications
- 1,215
- Assignees
- 666
- Inventors
- 2,696
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 18 | 0 |
| 1978 | 16 | 0 |
| 1979 | 21 | 0 |
| 1980 | 20 | 0 |
| 1981 | 24 | 0 |
| 1982 | 19 | 0 |
| 1983 | 15 | 0 |
| 1984 | 13 | 0 |
| 1985 | 18 | 0 |
| 1986 | 14 | 0 |
| 1987 | 21 | 0 |
| 1988 | 24 | 0 |
| 1989 | 18 | 0 |
| 1990 | 14 | 0 |
| 1991 | 8 | 0 |
| 1992 | 12 | 0 |
| 1993 | 16 | 0 |
| 1994 | 5 | 0 |
| 1995 | 12 | 0 |
| 1996 | 12 | 0 |
| 1997 | 6 | 0 |
| 1998 | 14 | 0 |
| 1999 | 10 | 0 |
| 2000 | 12 | 0 |
| 2001 | 24 | 11 |
| 2002 | 17 | 25 |
| 2003 | 19 | 27 |
| 2004 | 25 | 28 |
| 2005 | 17 | 15 |
| 2006 | 21 | 15 |
| 2007 | 8 | 17 |
| 2008 | 11 | 29 |
| 2009 | 13 | 17 |
| 2010 | 17 | 24 |
| 2011 | 13 | 31 |
| 2012 | 14 | 38 |
| 2013 | 11 | 25 |
| 2014 | 28 | 55 |
| 2015 | 33 | 54 |
| 2016 | 40 | 49 |
| 2017 | 40 | 58 |
| 2018 | 46 | 49 |
| 2019 | 53 | 53 |
| 2020 | 35 | 63 |
| 2021 | 48 | 85 |
| 2022 | 37 | 75 |
| 2023 | 45 | 67 |
| 2024 | 50 | 116 |
| 2025 | 54 | 120 |
| 2026 | 42 | 69 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01C 1/04Preparation of ammonia by synthesis754
- C01C 1/12Separation of ammonia from gases and vapours89
- C01C 1/024Purification84
- C01C 1/026Preparation of ammonia from inorganic compounds83
- C01C 1/08Preparation of ammonia from nitrogenous organic substances73
- C01C 1/10Separation of ammonia from ammonia liquors73
- C01C 1/022Preparation of aqueous ammonia solutions, i.e. ammonia water17
Recent patents
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- Nuclear reactor integrated oil and gas production systems and methods of operation6 Oct 2026US 12,753,674 B2Natura Resources LLC
- Solid-gas reaction to generate nitroxyl (HNO) in the gas phase22 Sep 2026US 12,740,999 B2Consejo Nacional De Investgaciones Cientficas Y Tecnicas Conicet
- Ruthenium promoter catalyst compositions15 Sep 2026US 12,735,324 B2Commonwealth Scientific and Industrial Research Organisation
- Purge gas conditioning of NH3 plants15 Sep 2026US 12,735,325 B2Stamicarbon B. V.
- Systems and methods for the production of ammonia8 Oct 2026US 2026/0308000 A1The Mosaic Company
- Ammonia Synthesis Converter and Method for Small Production Units8 Oct 2026US 2026/0308001 A1AmmPower America LLC
- Autonomous Modular Flare Gas Conversion Systems and Methods8 Oct 2026US 2026/0308093 A1M2X Energy Inc.
- Process for the production of high-purity melamine from the pyrolysis of urea, with optimization of the deammoniation step of the mother liquors8 Oct 2026US 2026/0308134 A1Eurotecnica Contractors & Engineers S.p.A.
- Method for producing low-carbon ammonia from natural gas1 Oct 2026US 2026/0296905 A1Publichnoe Aktsionernoe Obshchestvo "NOVATEK"
Most cited
By later US patents
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Methanol plant retrofit for acetic acid manufacture208US 6,232,352 B1Acetex limited · 2001
- Composite hydrogen separation element and module185US 5,498,278 ABend Research, Inc. · 1996
- Composite hydrogen separation element and module164US 5,645,626 ABend Research, Inc. · 1997
- Nanotechnology for engineering the performance of substances140US 6,531,704 B2NanoProducts Corporation · 2003