C21C 5/567
Operating in a continuous way
Official title: {operating in a continuous way}
C21C5/567 (Operating in a continuous way) appears on 141 US grants and 72 published applications in this corpus.
Search patents in C21C- Granted patents
- 141
- Published applications
- 72
- Assignees
- 81
- Inventors
- 262
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 8 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 7 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 6 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 2 | 2 |
| 2003 | 3 | 3 |
| 2004 | 0 | 3 |
| 2005 | 3 | 5 |
| 2006 | 1 | 12 |
| 2007 | 4 | 2 |
| 2008 | 3 | 4 |
| 2009 | 7 | 9 |
| 2010 | 5 | 5 |
| 2011 | 6 | 3 |
| 2012 | 7 | 3 |
| 2013 | 4 | 0 |
| 2014 | 1 | 2 |
| 2015 | 2 | 2 |
| 2016 | 1 | 3 |
| 2017 | 2 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 4 |
| 2023 | 2 | 0 |
| 2024 | 1 | 4 |
| 2025 | 0 | 0 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus for the production of molten iron7 Apr 2026US 12,595,520 B2Tata Steel Ijmuiden B.V.
- Method of producing molten iron using electric furnace including video device3 Mar 2026US 12,566,029 B2Jfe Steel Corporation
- Direct reduced iron system and method13 Aug 2024US 12,060,622 B2Nucor Corporation
- Process and system for steel and hydrogen production using recycled ferrous scrap and natural gas4 Jul 2023US 11,692,231 B2Palo Alto Research Center Incorporated
- Process and system for steel and hydrogen production using recycled ferrous scrap and natural gas20 Jun 2023US 11,680,299 B2Palo Alto Research Center Incorporated
- Novel process for the smelting of a metalliferous feedstock material yielding reduced carbon emissions1 Oct 2026US 2026/0297698 A1Metix (Proprietary) Limited
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Sulfur management in a smelting process21 May 2026US 2026/0139336 A1Nucor Corporation
- Direct reduced iron system and method5 Dec 2024US 2024/0401160 A1Nucor Corporation
- Direct reduced iron system and method using synthetic combustion air4 Jul 2024US 2024/0218474 A1Nucor Corporation
Most cited
By later US patents
- Process for the production of steel from fine ore hot briquetted after fluidized bed reduction49US 4,946,498 A1990
- Cold start-up method for a direct smelting process36US 7,914,601 B2Technological Resources Pty. Limited · 2011
- Metal refining method and apparatus33US 4,089,677 ABritish Steel Corporation · 1978
- Stable idle procedure31US 6,387,153 B1Technological Resources Pty. Limited · 2002
- Producing iron from solid iron carbide30US 6,328,783 B1Technological Resources Pty. Limited · 2001