C01C 1/242
Preparation from ammonia and sulfuric acid or sulfur trioxide
C01C1/242 (Preparation from ammonia and sulfuric acid or sulfur trioxide) appears on 65 US grants and 57 published applications in this corpus.
Search patents in C01C- Granted patents
- 65
- Published applications
- 57
- Assignees
- 52
- Inventors
- 159
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 3 | 1 |
| 2011 | 0 | 4 |
| 2012 | 3 | 1 |
| 2013 | 4 | 3 |
| 2014 | 2 | 3 |
| 2015 | 4 | 4 |
| 2016 | 2 | 5 |
| 2017 | 3 | 3 |
| 2018 | 5 | 3 |
| 2019 | 2 | 1 |
| 2020 | 3 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 2 |
| 2023 | 2 | 5 |
| 2024 | 4 | 5 |
| 2025 | 2 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method to produce a urea ammonium sulphate-based composition23 Jun 2026US 12,662,448 B2Yara International Asa
- Process for controlling hydrogen sulfide and ammonia flow rates2 Dec 2025US 12,485,384 B2Uop LLC
- Method and treatment facility for physical and thermochemical treatment of biomass2 Dec 2025US 12,486,460 B2Next Generation Elements GmbH
- Method for recycling supercritical waste liquid generated during process of producing silica aerogel blanket3 Dec 2024US 12,157,672 B2LG Chem.Ltd.
- System and method for production of granular ammonium sulfate17 Sep 2024US RE50,128 E1PCI Nitrogen, LLC
- Process for producing phosphate products and sulfate products1 Oct 2026US 2026/0296906 A1Susphos B.V.
- Process for Removing Salts from an Aluminium Dross14 May 2026US 2026/0132038 A1FinexTech (Pty) Ltd
- Lead-recovery process30 Apr 2026US 2026/0117341 A1
- Process for controlling hydrogen sulfide and ammonia flow rates1 Jan 2026US 2026/0001033 A1Uop LLC
- Sulfur dioxide depolarized electrolysis and electrolyzer therefore11 Sep 2025US 2025/0283237 A1Peregrine Hydrogen Inc.
Most cited
By later US patents
- Gas-liquid contact reaction apparatus67US 4,239,515 AChiyoda Chemical Engineering & Construction Co., Ltd. · 1980
- Production of ammonium sulfate33US 4,250,160 AExxon Research & Engineering Co. · 1981
- Flue gas desulfurization process and apparatus for removing nitrogen oxides26US 6,759,022 B2Marsulex Environmental Technologies Corporation · 2004
- Process for recovering base metals from spent hydroprocessing catalyst26US 7,658,895 B2Chevron U.S.A.Inc. · 2010
- Process for separating and recovering base metals from used hydroprocessing catalyst26US 7,837,960 B2Chevron U.S.A.Inc. · 2010