C01B 25/18
Phosphoric acid
C01B25/18 (Phosphoric acid) appears on 465 US grants and 165 published applications in this corpus.
Search patents in C01B- Granted patents
- 465
- Published applications
- 165
- Assignees
- 228
- Inventors
- 827
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 23 | 0 |
| 1977 | 25 | 0 |
| 1978 | 25 | 0 |
| 1979 | 20 | 0 |
| 1980 | 25 | 0 |
| 1981 | 44 | 0 |
| 1982 | 30 | 0 |
| 1983 | 21 | 0 |
| 1984 | 22 | 0 |
| 1985 | 21 | 0 |
| 1986 | 8 | 0 |
| 1987 | 24 | 0 |
| 1988 | 8 | 0 |
| 1989 | 16 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 0 |
| 2003 | 2 | 0 |
| 2004 | 2 | 5 |
| 2005 | 2 | 3 |
| 2006 | 2 | 2 |
| 2007 | 2 | 1 |
| 2008 | 2 | 2 |
| 2009 | 0 | 1 |
| 2010 | 2 | 2 |
| 2011 | 1 | 5 |
| 2012 | 2 | 8 |
| 2013 | 1 | 7 |
| 2014 | 8 | 5 |
| 2015 | 5 | 11 |
| 2016 | 5 | 14 |
| 2017 | 8 | 10 |
| 2018 | 7 | 5 |
| 2019 | 9 | 10 |
| 2020 | 10 | 10 |
| 2021 | 5 | 6 |
| 2022 | 5 | 8 |
| 2023 | 4 | 14 |
| 2024 | 4 | 10 |
| 2025 | 9 | 16 |
| 2026 | 8 | 10 |
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 purifying yellow phosphorus and method for producing high-purity phosphoric acid10 Feb 2026US 12,545,581 B2Rin Kagaku Kogyo Co., Ltd.
- 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 producing phosphate products and sulfate products1 Oct 2026US 2026/0296906 A1Susphos B.V.
- Method for producing a compound and apparatus for producing a compound27 Aug 2026US 2026/0250131 A1Helander Holding Oy
- 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.
Most cited
By later US patents
- Method of purification of phosphoric acid53US 4,495,165 A1985
- Automatic control system for phosphoric acid plant31US 5,262,963 AIMC Fertilizer, Inc. · 1993
- Method of precipitating radium to yield high purity calcium sulfate from phosphate ores28US 3,949,047 AGebr. Giulini GmbH · 1976
- Processes and equipment for production of elemental phosphorus and thermal phosphoric acid27US 4,919,906 AJames C. Barber and Associates, Inc. · 1990
- Production of stabilized wet process phosphoric acid25US 4,110,422 AW. R. Grace & Co. · 1978