C21C 1/025
Agents used for dephosphorising or desulfurising
Official title: {Agents used for dephosphorising or desulfurising}
C21C1/025 (Agents used for dephosphorising or desulfurising) appears on 107 US grants and 49 published applications in this corpus.
Search patents in C21C- Granted patents
- 107
- Published applications
- 49
- Assignees
- 69
- Inventors
- 283
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 9 | 0 |
| 1981 | 3 | 0 |
| 1982 | 8 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 4 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 4 |
| 2006 | 1 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 2 | 3 |
| 2015 | 2 | 6 |
| 2016 | 5 | 1 |
| 2017 | 2 | 4 |
| 2018 | 3 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 2 |
| 2021 | 0 | 3 |
| 2022 | 1 | 2 |
| 2023 | 4 | 3 |
| 2024 | 1 | 2 |
| 2025 | 3 | 1 |
| 2026 | 0 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hot-rolled, low-temperature-resistant, H-shaped steel with grade of yield strength of 420 MPa and preparation method therefor23 Dec 2025US 12,503,738 B2Shandong Iron and Steel Company Ltd.
- Device and method for continuous desulphurisation of liquid hot metal5 Aug 2025US 12,378,617 B2Tata Steel Nederland Technology B.V.
- Process for manufacturing a slag conditioning agent for steel desulfurization5 Aug 2025US 12,378,619 B2S. A. Lhoist Recherche et Developpement
- Process for manufacturing a slag conditioning agent for steel desulfurization19 Mar 2024US 11,932,914 B2S. A. Lhoist Recherche et Developpement
- Steel for wind power gear with improved purity and reliability, and smelting method therefor3 Oct 2023US 11,773,466 B2Daye Special Steel Co., Ltd.
- Method for manufacturing pig iron in a production line comprising an electrical smelting furnace10 Sep 2026US 2026/0265850 A1
- A method for manufacturing pig iron in a production line comprising an electrical smelting furnace3 Sep 2026US 2026/0258516 A1
- Sulfur management in a smelting process21 May 2026US 2026/0139336 A1Nucor Corporation
- A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace22 Jan 2026US 2026/0022429 A1
- A method for manufacturing pig iron in an electrical smelting furnace and associated smelting furnace15 Jan 2026US 2026/0015682 A1
Most cited
By later US patents
- Additive for use in refining iron23US 4,137,072 AToyo Soda Manufacturing Co., Ltd. · 1979
- Addition of magnesium to molten metal21US 4,040,818 AMagnesium Elektron Limited · 1977
- Method and composition for the desulfurization of molten metals17US 4,078,915 ASuddeutsche Kalkstickstoff-Werke Aktiengesellschaft · 1978
- Fine-grained agent for desulfurizing molten iron16US 4,764,211 ASKW Trostberg Aktiengesellschaft · 1988
- Desulphuration of metals14US 4,209,325 AFoseco International Limited · 1980