C25C 3/20
Automatic control or regulation of cells
Official title: Automatic control or regulation of cells (controlling or regulating in general G05)
C25C3/20 (Automatic control or regulation of cells) appears on 97 US grants and 73 published applications in this corpus.
Search patents in C25C- Granted patents
- 97
- Published applications
- 73
- Assignees
- 62
- Inventors
- 236
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 8 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 1 |
| 2004 | 0 | 4 |
| 2005 | 2 | 4 |
| 2006 | 3 | 4 |
| 2007 | 3 | 2 |
| 2008 | 3 | 3 |
| 2009 | 0 | 2 |
| 2010 | 2 | 5 |
| 2011 | 2 | 4 |
| 2012 | 3 | 1 |
| 2013 | 1 | 3 |
| 2014 | 0 | 10 |
| 2015 | 2 | 2 |
| 2016 | 2 | 5 |
| 2017 | 3 | 4 |
| 2018 | 5 | 2 |
| 2019 | 3 | 1 |
| 2020 | 2 | 2 |
| 2021 | 1 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 3 |
| 2024 | 2 | 2 |
| 2025 | 0 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and process for starting up an electrolytic cell4 Aug 2026US 12,698,567 B2Elysis Limited Partnership
- Systems and methods for preventing thermite reactions in electrolytic cells11 Jun 2024US 12,006,581 B2Elysis Limited Partnership
- Apparatus and method for controlled alumina supply11 Jun 2024US 12,006,582 B2REEL Alesa AG
- Device and method for determining the composition of an electrolyte20 Apr 2021US 10,982,342 B2United Company RUSAL Engineering and Technology Centre LLC
- Modified electrolysis cell and a method for modifying same23 Jun 2020US 10,689,770 B2Norsk Hydro ASA
- Method of starting up an electrolytic cell for aluminum production8 Oct 2026US 2026/0308793 A1Rio Tinto Alcan International Limited
- Waste Heat Recovery and Utilization System and method26 Mar 2026US 2026/0085887 A1Zhengzhou Non-Ferrous Metals Research Institute Co. Ltd of Chalco
- Aluminium smelting method & apparatus2 Oct 2025US 2025/0305172 A1Enpot Holdings Limited
- Electrowinning system with interconnectable intercell bars19 Jun 2025US 2025/0198030 A1
- Electrorefining installation with interconnectable intercell bars19 Jun 2025US 2025/0198031 A1
Most cited
By later US patents
- Product and process for the activation of an electrolytic cell64US 4,575,407 A1986
- Estimation and control of alumina concentration in hall cells31US 4,814,050 AAluminum Company of America · 1989
- Data acquisition systems18US 4,294,682 AAlcan Research and Development Limited · 1981
- Continuous measurement of electrolyte parameters in a cell for the electrolysis of a molten charge15US 4,098,651 ASwiss Aluminium Ltd. · 1978
- Anode and cathode current monitoring14US 6,136,177 AUniversal Dynamics Technologies Inc. · 2000