C25C
Processes for the electrolytic production, recovery or refining of metals
Official title: Processes for the electrolytic production, recovery or refining of metals; apparatus therefor
C25C (Processes for the electrolytic production, recovery or refining of metals) appears on 3,409 US grants and 2,362 published applications in this corpus.
Search patents in C25C- Granted patents
- 3,409
- Published applications
- 2,362
- Assignees
- 1,489
- Inventors
- 6,609
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 84 | 0 |
| 1977 | 122 | 0 |
| 1978 | 124 | 0 |
| 1979 | 95 | 0 |
| 1980 | 88 | 0 |
| 1981 | 88 | 0 |
| 1982 | 50 | 0 |
| 1983 | 92 | 0 |
| 1984 | 143 | 0 |
| 1985 | 97 | 0 |
| 1986 | 96 | 0 |
| 1987 | 82 | 0 |
| 1988 | 77 | 0 |
| 1989 | 57 | 0 |
| 1990 | 49 | 0 |
| 1991 | 47 | 0 |
| 1992 | 50 | 0 |
| 1993 | 42 | 0 |
| 1994 | 64 | 0 |
| 1995 | 64 | 0 |
| 1996 | 60 | 0 |
| 1997 | 45 | 0 |
| 1998 | 59 | 0 |
| 1999 | 45 | 0 |
| 2000 | 65 | 0 |
| 2001 | 65 | 18 |
| 2002 | 78 | 46 |
| 2003 | 57 | 60 |
| 2004 | 55 | 89 |
| 2005 | 34 | 69 |
| 2006 | 25 | 74 |
| 2007 | 28 | 81 |
| 2008 | 41 | 70 |
| 2009 | 27 | 77 |
| 2010 | 47 | 85 |
| 2011 | 51 | 82 |
| 2012 | 62 | 76 |
| 2013 | 57 | 122 |
| 2014 | 59 | 120 |
| 2015 | 73 | 93 |
| 2016 | 59 | 124 |
| 2017 | 68 | 98 |
| 2018 | 83 | 110 |
| 2019 | 86 | 83 |
| 2020 | 86 | 83 |
| 2021 | 65 | 67 |
| 2022 | 60 | 108 |
| 2023 | 57 | 118 |
| 2024 | 79 | 153 |
| 2025 | 71 | 146 |
| 2026 | 51 | 110 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- C25C 3/00Electrolytic production, recovery or refining of metals by electrolysis of melts1,645
- C25C 7/00Constructional parts, or assemblies thereof, of cells1,585
- C25C 1/00Electrolytic production, recovery or refining of metals by electrolysis of solutions1,105
- C25C 5/00Electrolytic production, recovery or refining of metal powders or porous metal masses164
Recent patents
- Electrochemical recycling of lithium from lithium-based materials6 Oct 2026US 12,753,523 B2GM Global Technology Operations LLC
- Systems and methods for direct oxide production29 Sep 2026US 12,747,511 B2Aqua Metals Inc.
- Electrolyzer with horizontal cathode29 Sep 2026US 12,747,512 B2Verdeen Chemicals Inc.
- High-selectivity hydrophilic electrode for extracting lithium and preparation method thereof22 Sep 2026US 12,742,250 B2Central South University
- Bipolar electrolyzer22 Sep 2026US 12,742,251 B2Verdeen Chemicals Inc.
- Method and reactor for the production of alkali metal8 Oct 2026US 2026/0308792 A1Electriq-Global Energy Solutions Ltd.
- Method of starting up an electrolytic cell for aluminum production8 Oct 2026US 2026/0308793 A1Rio Tinto Alcan International Limited
- In situ electrochemical hydrogen peroxide generation for hydrometallurgical lithium-ion battery recycling8 Oct 2026US 2026/0312161 A1The Trustees of Columbia University in the City of New York
- Systems and methods for lithium extraction from aqueous feedstocks1 Oct 2026US 2026/0295534 A1University of Utah Research Foundation
- Process and system for electrolytically producing an iron-bearing product from iron ore particles1 Oct 2026US 2026/0297782 A1Fortescue Future Industries Pty Ltd
Most cited
By later US patents
- Method for electrochemically producing an alkali metal from an aqueous solution135US 6,770,187 B1BASF SE · 2004
- Method of electrodepositing metal on electrically conducting particles119US 6,432,292 B1Metallic Power, Inc. · 2002
- Molten salt lithium cells111US 4,405,416 A1983
- Electrode material, electrode and electrochemical cell107US 4,422,917 AIMI Marston Limited · 1983
- Apparatus and method for the electrolytic production of metals89US 4,999,097 AMassachusetts Institute of Technology · 1991