C21C 7/04
Removing impurities by adding a treating agent
C21C7/04 (Removing impurities by adding a treating agent) appears on 762 US grants and 557 published applications in this corpus.
Search patents in C21C- Granted patents
- 762
- Published applications
- 557
- Assignees
- 402
- Inventors
- 2,032
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 26 | 0 |
| 1977 | 27 | 0 |
| 1978 | 23 | 0 |
| 1979 | 29 | 0 |
| 1980 | 30 | 0 |
| 1981 | 21 | 0 |
| 1982 | 17 | 0 |
| 1983 | 21 | 0 |
| 1984 | 18 | 0 |
| 1985 | 23 | 0 |
| 1986 | 16 | 0 |
| 1987 | 21 | 0 |
| 1988 | 16 | 0 |
| 1989 | 23 | 0 |
| 1990 | 15 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 8 | 0 |
| 1994 | 11 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 8 | 0 |
| 1999 | 9 | 0 |
| 2000 | 12 | 0 |
| 2001 | 7 | 2 |
| 2002 | 14 | 7 |
| 2003 | 10 | 13 |
| 2004 | 14 | 22 |
| 2005 | 7 | 14 |
| 2006 | 7 | 15 |
| 2007 | 4 | 15 |
| 2008 | 4 | 15 |
| 2009 | 13 | 21 |
| 2010 | 13 | 23 |
| 2011 | 15 | 25 |
| 2012 | 18 | 15 |
| 2013 | 10 | 14 |
| 2014 | 14 | 16 |
| 2015 | 15 | 27 |
| 2016 | 12 | 20 |
| 2017 | 17 | 21 |
| 2018 | 13 | 13 |
| 2019 | 18 | 23 |
| 2020 | 14 | 15 |
| 2021 | 8 | 20 |
| 2022 | 18 | 25 |
| 2023 | 14 | 42 |
| 2024 | 17 | 45 |
| 2025 | 38 | 49 |
| 2026 | 20 | 40 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for desulfurizing molten metal21 Jul 2026US 12,686,895 B2Jfe Steel Corporation
- Converter steelmaking method23 Jun 2026US 12,662,712 B2Jfe Steel Corporation
- Method for producing chromium-containing molten steel16 Jun 2026US 12,655,488 B2Jfe Steel Corporation
- Method for manufacturing low-phosphorus molten steel9 Jun 2026US 12,649,955 B2Jfe Steel Corporation
- Process for smelting steel for ultrafine silicon carbide sawing wire9 Jun 2026US 12,649,958 B2Baoshan Iron & Steel Co., Ltd.
- Method for producing molten steel1 Oct 2026US 2026/0297699 A1Jfe Steel Corporation
- Apparatus and method for refining liquid metal24 Sep 2026US 2026/0284739 A1Danieli & C. Officine Meccaniche SpA
- Production and preparation method of carburized gear shaft bars by means of converter process24 Sep 2026US 2026/0286458 A1Bengang Steel Plates Co., Ltd.
- A method for manufacturing molten pig iron into an electrical smelting furnace10 Sep 2026US 2026/0265845 A1
- Smelting and continuous casting method for high cr-si alloyed hot-formed steel3 Sep 2026US 2026/0257267 A1Bengang Steel Plates Co., Ltd.
Most cited
By later US patents
- Melting metal particles and dispersing gas with vaned impeller135US 5,143,357 AThe Carborundum Company · 1992
- Dispersing gas into molten metal131US 4,954,167 A1990
- Dispersing gas into molten metal130US 4,898,367 AStemcor Corporation · 1990
- Melting metal particles and dispersing gas and additives with vaned impeller127US 5,310,412 AMetaullics Systems Co., L.P. · 1994
- Molten metal degassing device and impellers therefor121US 6,689,310 B12004