C01B 25/20
Preparation from elemental phosphorus or phosphoric anhydride
C01B25/20 (Preparation from elemental phosphorus or phosphoric anhydride) appears on 31 US grants and 17 published applications in this corpus.
Search patents in C01B- Granted patents
- 31
- Published applications
- 17
- Assignees
- 20
- Inventors
- 72
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 4 |
| 2017 | 1 | 0 |
| 2018 | 2 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 3 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 2 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for purifying yellow phosphorus and method for producing high-purity phosphoric acid10 Feb 2026US 12,545,581 B2Rin Kagaku Kogyo Co., Ltd.
- Phosphorus oxide and phosphoric acid production processes14 Oct 2025US 12,441,616 B2Monsanto Technology LLC
- Total heat energy recovery system for furnace-process phosphoric acid26 Aug 2025US 12,398,039 B2Kunming University of Science and Technology
- Phosphorus oxide and phosphoric acid production processes26 Apr 2022US 11,312,627 B2Monsanto Technology LLC
- Raw material pre-treatment method and raw material pre-treatment process system suitable for kiln phosphoric acid process18 Aug 2020US 10,744,512 B2Sichuan Ko Chang Technology Co., Ltd.
- Method for producing a compound and apparatus for producing a compound27 Aug 2026US 2026/0250131 A1Helander Holding Oy
- Phosphorus oxide and phosphoric acid production processes1 Jan 2026US 2026/0001763 A1Monsanto Technology LLC
- Method for the combined recycling of phosphate and nitrogen from sewage sludge and optionally biological waste11 Apr 2024US 2024/0116792 A1Remondis Aqua GmbH & Co. KG
- Method for purifying yellow phosphorus and method for producing high-purity phosphoric acid24 Nov 2022US 2022/0371892 A1Rin Kagaku Kogyo Co., Ltd.
- Total Heat Energy Recovery System For Furnace-Process Phosphoric Acid8 Sep 2022US 2022/0281747 A1Kunming University of Science and Technology
Most cited
By later US patents
- Processes and equipment for production of elemental phosphorus and thermal phosphoric acid27US 4,919,906 AJames C. Barber and Associates, Inc. · 1990
- Permanent magnet manufacture from very low coercivity crystalline rare earth-transition metal-boron alloy23US 4,921,551 AGeneral Motors Corporation · 1990
- Method of preparing ultraphosphoric acid16US 4,309,394 AMonsanto Company · 1982
- Treatment of pyrophoric elemental phosphorus-containing material16US 4,686,094 AStauffer Chemical Company · 1987
- Process for making phosphorus pentoxide and optionally phosphoric acid with utilization of the reaction heat15US 4,603,039 AHoechst Aktiengesellschaft · 1986