C21D 9/0056
Furnaces through which the charge is moved in a horizontal straight path
Official title: {Furnaces through which the charge is moved in a horizontal straight path (C21D9/0043 takes precedence)}
C21D9/0056 (Furnaces through which the charge is moved in a horizontal straight path) appears on 86 US grants and 117 published applications in this corpus.
Search patents in C21D- Granted patents
- 86
- Published applications
- 117
- Assignees
- 87
- Inventors
- 312
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 3 |
| 2005 | 1 | 3 |
| 2006 | 2 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 6 |
| 2009 | 3 | 3 |
| 2010 | 4 | 3 |
| 2011 | 4 | 3 |
| 2012 | 2 | 3 |
| 2013 | 2 | 2 |
| 2014 | 0 | 7 |
| 2015 | 1 | 7 |
| 2016 | 4 | 9 |
| 2017 | 4 | 8 |
| 2018 | 2 | 8 |
| 2019 | 7 | 6 |
| 2020 | 7 | 2 |
| 2021 | 4 | 7 |
| 2022 | 4 | 4 |
| 2023 | 7 | 10 |
| 2024 | 0 | 4 |
| 2025 | 4 | 9 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Combined sintering-annealing furnace30US 4,579,319 AM. C. L. Co., Ltd. · 1986
- Continuous process for production of steel part with regions of different ductility10US 7,578,894 B2Benteler Automobiltechnik GmbH · 2009
- Preheating furnace9US 4,153,236 A1979
- Heat treatment furnace9US 7,090,488 B2Dowa Mining Co., Ltd. · 2006
- Continuous process for production of steel part with regions of different ductility9US 7,540,993 B2Benteler Automobiltechnik GmbH · 2009