C21C 5/5205
In a plasma heated furnace
Official title: {in a plasma heated furnace}
C21C5/5205 (In a plasma heated furnace) appears on 24 US grants and 22 published applications in this corpus.
Search patents in C21C- Granted patents
- 24
- Published applications
- 22
- Assignees
- 23
- Inventors
- 59
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 4 |
| 2012 | 1 | 2 |
| 2013 | 3 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 4 |
| 2025 | 1 | 3 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and system for injecting additional materials into a steelmaking vessel4 Nov 2025US 12,460,274 B1Tallman Technologies Inc.
- Systems and methods for lowering the reduction of iron ore energy7 Jul 2020US 10,704,121 B1Capital One Services, LLC
- Method and apparatus for coproduction of pig iron and high quality syngas1 Jul 2014US 8,764,875 B2
- Method and device for introducing dust into a metal melt of a pyrometallurgical installation3 Sep 2013US 8,524,145 B2Siemens Aktiengesellschaft
- Metallurgical process and plant therefor30 Jul 2013US 8,496,728 B2Outotec Oyj
- Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly oxide feeds16 Oct 2025US 2025/0320570 A1Hertha Metals, Inc.
- Method for producing molten iron using electric furnace12 Jun 2025US 2025/0188553 A1Jfe Steel Corporation
- Method for producing steel using super-pure iron ore powder and hydrogen17 Apr 2025US 2025/0122587 A1
- Molten steel refining method5 Sep 2024US 2024/0294998 A1Jfe Steel Corporation
- Steel production from iron melt15 Feb 2024US 2024/0052442 A1Primetals Technologies Austria GmbH
Most cited
By later US patents
- Method and apparatus for heating molten steel utilizing a plasma arc torch36US 4,918,282 APlasma Energy Corporation · 1990
- Method of melting titanium and other metals and alloys by plasma arc or electron beam17US 6,561,259 B2RMI Titanium Company · 2003
- Plasma-assisted melting16US 7,189,940 B2BTU International, Inc. · 2007
- Contact electrode for melting and heating furnaces with DC plasma heating10US 4,390,773 A1983
- Method and apparatus for coproduction of pig iron and high quality syngas8US 8,764,875 B22014