C21D 1/767
With forced gas circulation
Official title: with forced gas circulation; Reheating thereof
C21D1/767 (With forced gas circulation) appears on 124 US grants and 79 published applications in this corpus.
Search patents in C21D- Granted patents
- 124
- Published applications
- 79
- Assignees
- 104
- Inventors
- 290
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 7 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 1 |
| 2003 | 1 | 2 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 2 | 9 |
| 2007 | 2 | 1 |
| 2008 | 6 | 2 |
| 2009 | 1 | 7 |
| 2010 | 1 | 5 |
| 2011 | 3 | 2 |
| 2012 | 2 | 5 |
| 2013 | 2 | 1 |
| 2014 | 6 | 3 |
| 2015 | 2 | 3 |
| 2016 | 4 | 4 |
| 2017 | 2 | 2 |
| 2018 | 3 | 4 |
| 2019 | 3 | 5 |
| 2020 | 4 | 3 |
| 2021 | 4 | 0 |
| 2022 | 1 | 2 |
| 2023 | 0 | 1 |
| 2024 | 0 | 7 |
| 2025 | 0 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Processing method and processing apparatus for metal component19 May 2026US 12,630,914 B2Parker Netsushori Kogyo K.K.
- Direct flame preheating section for a continuous metal strip processing line31 Mar 2026US 12,590,761 B2Fives Stein
- Method and device for manufacturing steam-treated products10 May 2022US 11,326,223 B2Nippon Steel Nisshin Co., Ltd.
- Device and method for carrying out controlled oxidation of metal strips in a continuous furnace28 Sep 2021US 11,131,004 B2Fives Stein
- Batch furnace for annealing material and method for heat treatment20 Jul 2021US 11,066,714 B2Gautschi Engineering GmbH
- Jet-type direct-fired preheating system26 Mar 2026US 2026/0085374 A1Baoshan Iron & Steel Co., Ltd.
- Process for reduction of time in gas carburizing process and cooling apparatus therefor5 Mar 2026US 2026/0062785 A1M/S Hightemp Furnaces Limited
- Hydrogen recycling unit for high pressure gas quenching7 Aug 2025US 2025/0250650 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Steel material for hot forming, hot formed part, and method for manufacturing thereof1 May 2025US 2025/0137086 A1Posco
- Device for tempering an object6 Feb 2025US 2025/0044030 A1EBNER Industrieofenbau GmbH
Most cited
By later US patents
- Process and apparatus for heat treatment of workpieces by quenching with gases80US 5,630,322 AALD Vacuum Technologies GmbH · 1997
- Pass-through furnace for heat recovery in the heat treatment of aggregates of metallic articles or parts44US 4,582,301 A1986
- Thermal treating apparatus and process40US 5,997,286 AFord Motor Company · 1999
- Gas cooling system for processing furnace32US 4,906,182 AAbar Ipsen Industries, Inc. · 1990
- Batch coil annealing furnace and method28US 4,596,526 AWorthington Industries, Inc. · 1986