C21B 5/02
Making special pig-iron
Official title: Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
C21B5/02 (Making special pig-iron) appears on 54 US grants and 32 published applications in this corpus.
Search patents in C21B- Granted patents
- 54
- Published applications
- 32
- Assignees
- 46
- Inventors
- 158
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 2 |
| 2004 | 2 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 2 |
| 2011 | 2 | 2 |
| 2012 | 1 | 5 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 3 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 1 |
| 2018 | 2 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 2 |
| 2021 | 0 | 2 |
| 2022 | 1 | 5 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Biocarbon pellets with adjustable grindability index16 Jun 2026US 12,655,362 B2Carbon Technology Holdings, LLC
- Method for operation of blast furnace3 Mar 2026US 12,565,688 B2Kobe Steel, Ltd.
- Process of production of a polymer product8 Apr 2025US 12,269,926 B2I.Blu S.R.L.
- P process of making pig iron in a blast furnace using pellets containing thermoplastic and cellulosic materials7 Feb 2023US 11,572,597 B2Subcoal International B.V.
- Operating method of an iron making installation and associated operating installation13 Dec 2022US 11,525,167 B2ArcelorMittal
- Methods for producing ferrous alloys in metallurgical furnaces16 Jan 2025US 2025/0019781 A1
- Process of production of a polymer product6 Oct 2022US 2022/0315724 A1I.Blu S.R.L.
- Biocarbon pellets with adjustable grindability index21 Jul 2022US 2022/0228080 A1Carbon Technology Holdings, LLC
- Processes for producing biocarbon pellets with adjustable grindability index21 Jul 2022US 2022/0228081 A1Carbon Technology Holdings, LLC
- Reactivity-moderated biocarbon pellets21 Jul 2022US 2022/0228082 A1Carbon Technology Holdings, LLC
Most cited
By later US patents
- Process of using olivine in a blast furnace111US 3,966,456 AMolten Metal Engineering Co. · 1976
- Method of thermal utilization of waste materials25US 5,550,312 ANoell-DBI Energie-Und Entsorgungstechnik GmbH · 1996
- Rotary hearth furnace for reducing oxides, and method of operating the furnace23US 6,270,552 B1Kawasaki Steel Corporation · 2001
- Process for the gasification of sewage sludge20US 4,793,855 A1988
- Treatment process for resins or organic compounds, or waste plastics containing them17US 6,436,168 B1Nippon Steel Corporation · 2002