C25C 3/00
Electrolytic production, recovery or refining of metals by electrolysis of melts
Official title: Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C5/00 takes precedence)
C25C3/00 (Electrolytic production, recovery or refining of metals by electrolysis of melts) appears on 1,645 US grants and 1,086 published applications in this corpus.
Search patents in C25C- Granted patents
- 1,645
- Published applications
- 1,086
- Assignees
- 641
- Inventors
- 2,902
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 25 | 0 |
| 1977 | 41 | 0 |
| 1978 | 50 | 0 |
| 1979 | 43 | 0 |
| 1980 | 39 | 0 |
| 1981 | 32 | 0 |
| 1982 | 25 | 0 |
| 1983 | 48 | 0 |
| 1984 | 81 | 0 |
| 1985 | 61 | 0 |
| 1986 | 62 | 0 |
| 1987 | 40 | 0 |
| 1988 | 43 | 0 |
| 1989 | 30 | 0 |
| 1990 | 25 | 0 |
| 1991 | 27 | 0 |
| 1992 | 30 | 0 |
| 1993 | 16 | 0 |
| 1994 | 38 | 0 |
| 1995 | 29 | 0 |
| 1996 | 27 | 0 |
| 1997 | 17 | 0 |
| 1998 | 24 | 0 |
| 1999 | 25 | 0 |
| 2000 | 37 | 0 |
| 2001 | 29 | 12 |
| 2002 | 51 | 27 |
| 2003 | 36 | 40 |
| 2004 | 32 | 63 |
| 2005 | 21 | 39 |
| 2006 | 19 | 45 |
| 2007 | 19 | 49 |
| 2008 | 20 | 43 |
| 2009 | 14 | 45 |
| 2010 | 28 | 34 |
| 2011 | 28 | 38 |
| 2012 | 25 | 34 |
| 2013 | 22 | 62 |
| 2014 | 32 | 57 |
| 2015 | 30 | 42 |
| 2016 | 29 | 49 |
| 2017 | 32 | 37 |
| 2018 | 37 | 38 |
| 2019 | 34 | 39 |
| 2020 | 29 | 33 |
| 2021 | 30 | 30 |
| 2022 | 28 | 38 |
| 2023 | 21 | 39 |
| 2024 | 34 | 64 |
| 2025 | 28 | 49 |
| 2026 | 22 | 40 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C25C 3/06Electrolytic production, recovery or refining of metals by electrolysis of melts: of1,186
- C25C 3/34Electrolytic production, recovery or refining of metals by electrolysis of melts: of173
- C25C 3/02Electrolytic production, recovery or refining of metals by electrolysis of melts: of125
- C25C 3/26Electrolytic production, recovery or refining of metals by electrolysis of melts: of108
- C25C 3/04Electrolytic production, recovery or refining of metals by electrolysis of melts: of86
- C25C 3/36Alloys obtained by cathodic reduction of all their ions39
- C25C 3/30Electrolytic production, recovery or refining of metals by electrolysis of melts: of13
- C25C 3/32Electrolytic production, recovery or refining of metals by electrolysis of melts: of12
Recent patents
- Method for producing highB purity aluminum from aluminum chloride25 Aug 2026US 12,715,778 B2Aluminum Technologies, LLC
- Selective recovery of rare earth elements from alloys by electrochemical leaching and electrodeposition25 Aug 2026US 12,716,143 B2Battelle Memorial Institute
- Lithium-mediated electrochemical ammonia synthesis11 Aug 2026US 12,703,921 B2Carnegie Mellon University
- System and process for starting up an electrolytic cell4 Aug 2026US 12,698,567 B2Elysis Limited Partnership
- Methods for extracting lithium from spodumene23 Jun 2026US 12,662,745 B2Xerion Advanced Battery Corp.
- Method of starting up an electrolytic cell for aluminum production8 Oct 2026US 2026/0308793 A1Rio Tinto Alcan International Limited
- Electrorefining cathode assembly with deposit compactor for metal co-deposition and method20 Aug 2026US 2026/0242968 A1Uchicago Argonne, LLC
- System and method for collecting and pre-treating process gases generated by an electrolysis cell6 Aug 2026US 2026/0226642 A1Elysis Limited Partnership
- System for solid-state electricity storage and solid-state electricity generation6 Aug 2026US 2026/0229568 A1
- Production of magnesium30 Jul 2026US 2026/0218334 A1Njordur Holding ehf.
Most cited
By later US patents
- Molten salt lithium cells111US 4,405,416 A1983
- Apparatus and method for the electrolytic production of metals89US 4,999,097 AMassachusetts Institute of Technology · 1991
- Low temperature alkali metal electrolysis77US 6,368,486 B1E. I. Du Pont de Nemours and Company · 2002
- Non-consumable anode and lining for aluminum electrolytic reduction cell73US 5,284,562 ABrooks Rand Inc · 1994
- Electrolysis cell for a molten electrolyte67US 4,604,177 AAlcan International Limited · 1986