C21D 9/0037
Rotary furnaces with vertical axis
Official title: {Rotary furnaces with vertical axis; Furnaces with rotating floor}
C21D9/0037 (Rotary furnaces with vertical axis) appears on 35 US grants and 19 published applications in this corpus.
Search patents in C21D- Granted patents
- 35
- Published applications
- 19
- Assignees
- 32
- Inventors
- 93
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 1 | 3 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 0 | 1 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Workpiece holding device6 Oct 2026US 12,753,453 B2Aktiebolaget Skf
- Method for producing water-absorbent resin particles9 Jul 2024US 12,030,997 B2Nippon Shokubai Co., Ltd.
- Rotary heat treatment furnace27 Nov 2018US 10,139,164 B2Central Motor Wheel Co., Ltd.
- High pressure heat treatment system4 Mar 2014US 8,663,547 B2Consolidated Engineering Company, Inc.
- Heating furnace for press hardening process27 Mar 2012US 8,142,712 B2Hyundai Steel Company
- Workpiece holding device14 Sep 2023US 2023/0287532 A1
- Workpiece holding device14 Sep 2023US 2023/0287533 A1Aktiebolaget Skf
- Method for producing water-absorbent resin particles2 Sep 2021US 2021/0269606 A1Nippon Shokubai Co., Ltd.
- Rotary heat treatment furnace27 Oct 2016US 2016/0313061 A1Central Motor Wheel Co., Ltd.
- Heat treatment furnace and heat treatment device having the same2 Apr 2015US 2015/0093711 A1Kabushiki Kaisha Toshiba
Most cited
By later US patents
- Rotary hearth furnace with preheat conveyor35US 4,111,644 ASelas Corporation of America · 1978
- Method and apparatus for carburizing, quenching and tempering30US 5,868,871 ADowa Mining Co., Ltd. · 1999
- Method and equipment for bringing metal alloy ingots, billets and the like to the semisolid or semiliquid state in readiness for thixotropic forming22US 5,665,302 AReynolds Wheels International Ltd. · 1997
- Method and apparatus for heat treating20US 5,306,359 ABGK Finishing Systems, Inc. · 1994
- Rotary hearth multi-chamber, multi-purpose furnace system19US 4,763,880 AHolcroft/Loftus Inc. · 1988