C22B 3/3844
Phosphonic acid
Official title: {Phosphonic acid, e.g. H2P(O)(OH)2}
C22B3/3844 (Phosphonic acid) appears on 77 US grants and 79 published applications in this corpus.
Search patents in C22B- Granted patents
- 77
- Published applications
- 79
- Assignees
- 79
- Inventors
- 269
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 2 | 0 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 3 |
| 2020 | 0 | 5 |
| 2021 | 2 | 4 |
| 2022 | 4 | 5 |
| 2023 | 4 | 18 |
| 2024 | 11 | 12 |
| 2025 | 9 | 16 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for recycling nickel, cobalt and manganese from feed liquid containing nickel, cobalt and manganese28 Apr 2026US 12,612,681 B2Suzhou Botree Cycling Sci & Tech Co., Ltd
- Method for separating cobalt and nickel17 Mar 2026US 12,577,636 B2Mitsubishi Materials Corporation
- Method for recovering active metal of lithium secondary battery10 Feb 2026US 12,545,974 B2SK Innovation Co., Ltd.
- Method for producing lithium hydroxide6 Jan 2026US 12,515,960 B2Jx Metals Circular Solutions Co., Ltd.
- Method for lithium recovery by extraction-stripping separation and purification25 Nov 2025US 12,480,179 B2Institute of Process Engineering, Chinese Academy of Sciences
- Method for removing the actinium contained in a rare earth solution with an organophosphorus solvent and rare earth compositions obtained by this method30 Jul 2026US 2026/0218335 A1Carester
- Lithium recovery18 Jun 2026US 2026/0167512 A1Novalith Technologies Pty Limited
- Method for recovering active metal of lithium secondary battery7 May 2026US 2026/0125776 A1SK Innovation Co., Ltd.
- Recycling Of Nickel And/Or Lithium From Spent Cathodes Forming Battery Grade Material19 Mar 2026US 2026/0078468 A1
- Method for recovering metals19 Feb 2026US 2026/0049375 A1Jx Metals Circular Solutions Co., Ltd.
Most cited
By later US patents
- Recovery of gold from aqueous solutions51US 4,913,730 ACanadian Patents and Development Limited · 1990
- Method of recovering metal from metalliferous waste37US 3,966,569 AMX Processor Reinhardt & Co. AB · 1976
- Recovering zinc from a material containing zinc and iron32US 4,124,462 AMX-Processer Reinhardt & Co. AB · 1978
- Separation of nickel and cobalt from sulfate solutions by solvent extraction32US 4,900,522 AAmax Inc. · 1990
- Extracting metal ions with diphosphonic acid, or derivative thereof25US 5,332,531 AArch Development Corporation · 1994