C21C 1/04
Removing impurities other than carbon, phosphorus or sulfur
C21C1/04 (Removing impurities other than carbon, phosphorus or sulfur) appears on 30 US grants and 21 published applications in this corpus.
Search patents in C21C- Granted patents
- 30
- Published applications
- 21
- Assignees
- 30
- Inventors
- 124
- Latest grant
- 13 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 1 |
| 2015 | 0 | 2 |
| 2016 | 2 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 1 | 2 |
| 2023 | 0 | 1 |
| 2024 | 0 | 3 |
| 2025 | 2 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for producing clean steel products with a low nitrogen content using an electric arc furnace and a degassing system13 May 2025US 12,296,379 B2Ternium México, S.A. de C.V.
- Method for producing molten steel22 Apr 2025US 12,281,365 B2Kobe Steel, Ltd.
- Method of dechromizing molten iron and method of manufacturing phosphate fertilizer raw material22 Feb 2022US 11,254,992 B2Nippon Steel Corporation
- Method for ironmaking by smelting reduction in stir-generated vortex17 Aug 2021US 11,091,816 B2Northeastern University
- Method for preliminary treatment of molten iron20 Mar 2018US 9,920,390 B2Jfe Steel Corporation
- Method for manufacturing high-chromium (cr) molten steel, method for manufacturing cast piece, and method for manufacturing press roll16 Apr 2026US 2026/0103769 A1Posco
- Iron production additive12 Mar 2026US 2026/0071290 A1Pure Metal Technologies, LLC
- Process for producing clean steel with a low nitrogen content using an electric arc furnace and a degassing system13 Mar 2025US 2025/0083218 A1Ternium México, S.A. de C.V.
- Method for refining molten iron15 Aug 2024US 2024/0271233 A1Jfe Steel Corporation
- Method for operating converter and method for producing molten steel23 May 2024US 2024/0167112 A1Jfe Steel Corporation
Most cited
By later US patents
- Method for producing improved metal castings by pneumatically refining the melt8US 4,208,206 AUnion Carbide Corporation · 1980
- Production of ultra-low phosphorus steel5US 4,456,477 ASumitomo Metal Industries, Ltd. · 1984
- Installation for the production of steel by pre-smelting of pig iron5US 4,627,601 AIrsid · 1986
- Production of stainless steel of AISI 4xx grade ferritic steel in an AOD converter3US 7,819,940 B2SMS Siemag Aktiengesellschaft · 2010
- Steel making process2US 4,295,882 ANippon Steel Corporation · 1981