Y02P 20/20
Improvements relating to chlorine production
Y02P20/20 (Improvements relating to chlorine production) appears on 34 US grants and 36 published applications in this corpus.
Search patents in Y02P- Granted patents
- 34
- Published applications
- 36
- Assignees
- 27
- Inventors
- 127
- Latest grant
- 2 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 5 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 1 | 4 |
| 2012 | 1 | 1 |
| 2013 | 0 | 4 |
| 2014 | 0 | 1 |
| 2015 | 1 | 4 |
| 2016 | 3 | 1 |
| 2017 | 1 | 3 |
| 2018 | 3 | 2 |
| 2019 | 1 | 3 |
| 2020 | 1 | 0 |
| 2021 | 2 | 0 |
| 2022 | 0 | 3 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Heteroatom-doped carbon catalyst for electrocatalytic halogen production2 Sep 2025US 12,404,592 B2Ohio State Innovation Foundation
- Method for manufacturing ruthenium oxide-supported catalyst for preparing chlorine and catalyst manufactured thereby20 May 2025US 12,303,872 B2Hanwha Solutions Corporation
- Hydrogen chloride oxidation reaction catalyst for preparing chlorine, and preparation method therefor8 Apr 2025US 12,269,015 B2Hanwah Solutions Corporation
- Energy management method and arrangement16 Jan 2024US 11,873,565 B2Tercosys Oy
- Methods and systems for recovering products from iron and steel slag2 Nov 2021US 11,162,158 B2
- Hydrogen chloride oxidation reaction catalyst for preparing chlorine, and preparation method terefor19 Jun 2025US 2025/0196106 A1Hanwha Solutions Corporation
- Hydrogen chloride oxidation reaction catalyst for preparing chlorine, and preparation method terefor19 Jun 2025US 2025/0196107 A1Hanwha Solutions Corporation
- Hydrogen chloride oxidation reaction catalyst for preparing chlorine, and preparation method terefor17 Mar 2022US 2022/0080395 A1Hanwha Solutions Corporation
- Method for manufacturing ruthenium oxide-supported catalyst for preparing chlorine and catalyst manufactured thereby10 Mar 2022US 2022/0072513 A1Hanwha Solutions Corporation
- Energy management method and arrangement10 Feb 2022US 2022/0042181 A1Tercosys Oy
Most cited
By later US patents
- Apparatus for production of sodium hypochlorite28US 4,248,690 APennwalt Corporation · 1981
- Production process of chlorine17US 4,803,065 AMitsui Toatsu Chemicals, Inc. · 1989
- Manufacturing process of chlorine17US 4,822,589 AMitsui Toatsu Chemicals, Inc. · 1989
- Recovery of chlorine from hydrogen chloride by carrier catalyst process13US 4,959,202 AMedalert Corporation · 1990
- Production of chlorinated compounds by use of molten salts10US 4,329,525 AThe Lummus Company · 1982