C01B 25/234
Purification
Official title: Purification; Stabilisation; Concentration (purification concomitant with preparation C01B25/22; preparation involving solvent-solvent extraction C01B25/46)
C01B25/234 (Purification) appears on 251 US grants and 73 published applications in this corpus.
Search patents in C01B- Granted patents
- 251
- Published applications
- 73
- Assignees
- 130
- Inventors
- 427
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 12 | 0 |
| 1978 | 13 | 0 |
| 1979 | 10 | 0 |
| 1980 | 15 | 0 |
| 1981 | 30 | 0 |
| 1982 | 12 | 0 |
| 1983 | 12 | 0 |
| 1984 | 12 | 0 |
| 1985 | 15 | 0 |
| 1986 | 4 | 0 |
| 1987 | 17 | 0 |
| 1988 | 4 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 2 |
| 2005 | 2 | 1 |
| 2006 | 1 | 2 |
| 2007 | 1 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 1 | 1 |
| 2012 | 2 | 4 |
| 2013 | 1 | 4 |
| 2014 | 4 | 1 |
| 2015 | 2 | 7 |
| 2016 | 0 | 3 |
| 2017 | 5 | 5 |
| 2018 | 3 | 2 |
| 2019 | 4 | 4 |
| 2020 | 4 | 3 |
| 2021 | 2 | 2 |
| 2022 | 1 | 2 |
| 2023 | 2 | 9 |
| 2024 | 3 | 3 |
| 2025 | 4 | 10 |
| 2026 | 5 | 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.
- 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
- Process for the removal of heavy metals from a phosphoric acid containing composition using a flocculating agent10 Feb 2026US 12,545,582 B2Yara International Asa
- Process for the removal of heavy metals from a phosphoric acid containing composition10 Feb 2026US 12,545,583 B2Yara International Asa
- Process for the removal of heavy metals from a phosphoric acid containing composition using an ionic polymeric surfactant and use of said surfactant in the precipitation of heavy metals in a phosphoric acid containing composition10 Feb 2026US 12,545,584 B2Yara International Asa
- Processing Of Phosphate Solutions6 Aug 2026US 2026/0225888 A1Easymining Sweden AB
- Method for recovering valuable constituents from struvite6 Aug 2026US 2026/0225967 A1
- Compositions and processes for removing heavy metals from phosphoric acid containing streams9 Jul 2026US 2026/0193083 A1Cytec Industries Inc.
- 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
- Method for producing high-purity phosphoric acid through quantum behavior control18 Dec 2025US 2025/0382174 A1Ram Technology Co., Ltd.
Most cited
By later US patents
- Method of purification of phosphoric acid53US 4,495,165 A1985
- Production of stabilized wet process phosphoric acid25US 4,110,422 AW. R. Grace & Co. · 1978
- Metallic ion removal from phosphoric acid22US 4,136,199 AOccidental Chemical Corporation · 1979
- Uranium recovery from wet-process phosphoric acid22US 4,180,545 ATennessee Valley Authority · 1979
- Recovery of fluorine, uranium and rare earth metal values from phosphoric acid by-product brine raffinate21US 3,937,783 AAllied Chemical Corporation · 1976