C01B 25/16
Oxyacids of phosphorus
Official title: Oxyacids of phosphorus; Salts thereof (peroxyacids or salts thereof C01B15/00)
C01B25/16 (Oxyacids of phosphorus) appears on 2,447 US grants and 2,484 published applications in this corpus.
Search patents in C01B- Granted patents
- 2,447
- Published applications
- 2,484
- Assignees
- 1,373
- Inventors
- 6,205
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 60 | 0 |
| 1977 | 59 | 0 |
| 1978 | 46 | 0 |
| 1979 | 45 | 0 |
| 1980 | 55 | 0 |
| 1981 | 77 | 0 |
| 1982 | 67 | 0 |
| 1983 | 59 | 0 |
| 1984 | 43 | 0 |
| 1985 | 47 | 0 |
| 1986 | 28 | 0 |
| 1987 | 54 | 0 |
| 1988 | 39 | 0 |
| 1989 | 41 | 0 |
| 1990 | 27 | 0 |
| 1991 | 32 | 0 |
| 1992 | 29 | 0 |
| 1993 | 22 | 0 |
| 1994 | 25 | 0 |
| 1995 | 26 | 0 |
| 1996 | 22 | 0 |
| 1997 | 19 | 0 |
| 1998 | 15 | 0 |
| 1999 | 22 | 0 |
| 2000 | 22 | 0 |
| 2001 | 23 | 3 |
| 2002 | 21 | 27 |
| 2003 | 22 | 28 |
| 2004 | 19 | 36 |
| 2005 | 18 | 42 |
| 2006 | 21 | 42 |
| 2007 | 20 | 42 |
| 2008 | 23 | 39 |
| 2009 | 20 | 58 |
| 2010 | 33 | 100 |
| 2011 | 34 | 100 |
| 2012 | 57 | 125 |
| 2013 | 64 | 101 |
| 2014 | 69 | 114 |
| 2015 | 104 | 137 |
| 2016 | 78 | 119 |
| 2017 | 103 | 111 |
| 2018 | 95 | 103 |
| 2019 | 94 | 86 |
| 2020 | 82 | 107 |
| 2021 | 68 | 122 |
| 2022 | 61 | 98 |
| 2023 | 75 | 154 |
| 2024 | 92 | 210 |
| 2025 | 95 | 206 |
| 2026 | 75 | 174 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01B 25/26Phosphates1,881
- C01B 25/18Phosphoric acid465
- C01B 25/46Preparation involving solvent-solvent extraction90
- C01B 25/163Phosphorous acid33
- C01B 25/165Hypophosphorous acid30
- C01B 25/24Condensed phosphoric acids28
- C01B 25/168Pyrophosphorous acid7
- C01B 25/161Containing at least one phosphorus atom with an oxidation number less than0
Recent patents
- Method for preparing lithium manganese iron phosphate, cathode material, and lithium-ion battery6 Oct 2026US 12,753,077 B2Phylion Battery Co., Ltd.
- Preparation method for iron phosphate powder by microporous filtration and concentration and preparation device thereof6 Oct 2026US 12,753,078 B2Zhejiang Dong'ou Filtering Machinery Manufacturing Co., Ltd.
- Rechargeable lithium battery with an improved ε-VOPO4 cathode, and applications thereof6 Oct 2026US 12,755,970 B2The Research Foundation for The State University of New York
- Heterogeneous catalyst for transesterification and method of preparing same6 Oct 2026US RE51,051 E1Crystaphase Products, Inc.
- Positive active material for energy storage device, positive electrode for energy storage device, energy storage device, and energy storage apparatus29 Sep 2026US 12,749,676 B2GS Yuasa International Ltd.
- Lithium iron phosphate precursor, lithium iron phosphate cathode material with high compaction density, and manufacturing method thereof8 Oct 2026US 2026/0307993 A1Advanced Lithium Electrochemistry Co., Ltd.
- Melt process for preparing alkali metal phosphate cathode materials from variable composition sources8 Oct 2026US 2026/0307994 A1Ignis Lithium Inc.
- Manufacturing method for lithium phosphate1 Oct 2026US 2026/0296888 A1Posco Holdings Inc.
- Methods for Preparing Ferromanganese Oxide, Lithium Manganese Iron Phosphate Material, and Cathode Plate1 Oct 2026US 2026/0296889 A1Hubei Hongrun High-Tech New Materials Co., Ltd.
- Process for producing phosphate products and sulfate products1 Oct 2026US 2026/0296906 A1Susphos B.V.
Most cited
By later US patents
- Cathode materials for secondary (rechargeable) lithium batteries408US 5,910,382 ABoard of Regents, The University of Texas Systems · 1999
- Bioresorbable ceramic composites294US 6,027,742 AEtex Corporation · 2000
- Bioresorbable ceramic composites284US 6,331,312 B1Etex Corporation · 2001
- Nanocrystalline apatites and composites, prostheses incorporating them, and method for their production242US 6,013,591 AMassachusetts Institute of Technology · 2000
- Bone substitution material and a method of its manufacture232US 6,214,368 B1Etex Corporation · 2001