C01B 25/222
With sulfuric acid, a mixture of acids mainly consisting of sulfuric acid
Official title: with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
C01B25/222 (With sulfuric acid, a mixture of acids mainly consisting of sulfuric acid) appears on 136 US grants and 49 published applications in this corpus.
Search patents in C01B- Granted patents
- 136
- Published applications
- 49
- Assignees
- 88
- Inventors
- 244
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 11 | 0 |
| 1982 | 12 | 0 |
| 1983 | 9 | 0 |
| 1984 | 11 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 5 | 0 |
| 1993 | 6 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 3 |
| 2013 | 1 | 1 |
| 2014 | 2 | 2 |
| 2015 | 1 | 3 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 4 |
| 2020 | 5 | 4 |
| 2021 | 1 | 2 |
| 2022 | 3 | 3 |
| 2023 | 3 | 6 |
| 2024 | 1 | 2 |
| 2025 | 4 | 4 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for producing technical grade phosphoric acid from sewage sludge ash25 Aug 2026US 12,715,771 B2Tecnicas Reunidas S. A.
- Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid28 Apr 2026US 12,612,309 B2thyssenkrupp AG
- Method for producing phosphoric acid and calcium sulphate quality suitable for a clinker process for the commercial and industrial utilization of calcium sulphate24 Mar 2026US 12,583,747 B2thyssenkrupp AG
- Method for separating and purifying phosphoric acid and phosphogypsum from wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby7 Oct 2025US 12,434,977 B2Institute of Process Engineering, Chinese Academy of Sciences
- Universal chemical processor29 Apr 2025US 12,285,753 B2Advanced Fusion Systems LLC
- Process for producing phosphate products and sulfate products1 Oct 2026US 2026/0296906 A1Susphos B.V.
- Process for the production of a purified phosphoric acid solution and/or dicalcium phosphate salts11 Jun 2026US 2026/0159391 A1Takhim for Technology and Business Services
- A method for producing ferrous sulphate and phosphoric acid12 Mar 2026US 2026/0070788 A1Kemira Oyj
- Method for fluorine separation and recovery from phosphate rock enhanced with microbubble coupled silicon additive19 Feb 2026US 2026/0048997 A1Institute of Process Engineering, Chinese Academy of Sciences
- Methods for preparation of ca nutrient to support carbon neutrality4 Dec 2025US 2025/0367598 A1Sabic Agri-Nutrients Company
Most cited
By later US patents
- Automatic control system for phosphoric acid plant31US 5,262,963 AIMC Fertilizer, Inc. · 1993
- Recovery of calcium fluoride from phosphate operation waste water25US 4,171,342 AOccidental Chemical Corporation · 1979
- Filtration aids for removal of calcium solids from aqueous phosphoric acid23US 4,800,071 ANalco Chemical Company · 1989
- Method of dewatering a wet process phosphoric acid slurry20US 5,185,135 ANalco Chemical Company · 1993
- Removal of magnesium and aluminum impurities from wet process phosphoric acid18US 4,299,804 AAgrico Chemical Company · 1981