C21B 3/04
Recovery of by-products
Official title: Recovery of by-products, e.g. slag
C21B3/04 (Recovery of by-products) appears on 400 US grants and 236 published applications in this corpus.
Search patents in C21B- Granted patents
- 400
- Published applications
- 236
- Assignees
- 293
- Inventors
- 941
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 23 | 0 |
| 1978 | 17 | 0 |
| 1979 | 17 | 0 |
| 1980 | 11 | 0 |
| 1981 | 12 | 0 |
| 1982 | 12 | 0 |
| 1983 | 10 | 0 |
| 1984 | 6 | 0 |
| 1985 | 10 | 0 |
| 1986 | 5 | 0 |
| 1987 | 10 | 0 |
| 1988 | 8 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 9 | 0 |
| 1996 | 10 | 0 |
| 1997 | 12 | 0 |
| 1998 | 4 | 0 |
| 1999 | 12 | 0 |
| 2000 | 7 | 0 |
| 2001 | 14 | 5 |
| 2002 | 9 | 8 |
| 2003 | 7 | 7 |
| 2004 | 4 | 5 |
| 2005 | 5 | 6 |
| 2006 | 0 | 4 |
| 2007 | 2 | 10 |
| 2008 | 4 | 6 |
| 2009 | 4 | 13 |
| 2010 | 8 | 4 |
| 2011 | 7 | 10 |
| 2012 | 4 | 7 |
| 2013 | 6 | 13 |
| 2014 | 4 | 5 |
| 2015 | 10 | 14 |
| 2016 | 6 | 15 |
| 2017 | 8 | 6 |
| 2018 | 3 | 10 |
| 2019 | 12 | 14 |
| 2020 | 13 | 13 |
| 2021 | 5 | 6 |
| 2022 | 6 | 9 |
| 2023 | 9 | 10 |
| 2024 | 8 | 14 |
| 2025 | 6 | 13 |
| 2026 | 6 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Cooling apparatus23 Jun 2026US 12,663,213 B2Material Handling Technology S.R.L.
- Method for the cooling and heat recovery from materials at very high temperature9 Jun 2026US 12,649,690 B2Cicsa S.R.L.
- Integrated drying process and device for dry granulated slag and sludge2 Jun 2026US 12,644,161 B2Baoshan Iron & Steel Co., Ltd.
- Process and system for the production of iron nuggets12 May 2026US 12,624,406 B2Carbontec Energy Corporation
- High efficiency processing method and plant for multiphase steel slag5 May 2026US 12,618,118 B2Baoshan Iron & Steel Co., Ltd.
- Comprehensive utilization method for steel making slag13 Aug 2026US 2026/0234753 A1Yuanchu Technology (Beijing) Co., Ltd.
- Method for melting direct reduced iron, solid iron and method for producing the same, and material for civil engineering and construction and method for producing the same2 Jul 2026US 2026/0185171 A1Jfe Steel Corporation
- Method for producing metallic iron25 Jun 2026US 2026/0176707 A1Jef Steel Corporation
- Beneficiation of metal slags for use as cement material18 Jun 2026US 2026/0167564 A1CemVision AB
- Electrochemical metallurgical slag recycling14 May 2026US 2026/0132484 A1Electrasteel, Inc.
Most cited
By later US patents
- Apparatus for dissociating bulk waste in a molten metal bath115US 5,555,822 AMolten Metal Technology, Inc. · 1996
- Process for solidifying aqueous wastes and products thereof71US 4,124,405 APEC-Engineering Societe Anonyme · 1978
- Recovery process61US 4,647,443 A1987
- Recovery apparatus49US 5,057,189 A1991
- Cement composition38US 6,840,996 B2Denki Kagaku Kogyo Kabushiki Kaisha · 2005