C21D 1/52
With flames
Official title: with flames
C21D1/52 (With flames) appears on 85 US grants and 99 published applications in this corpus.
Search patents in C21D- Granted patents
- 85
- Published applications
- 99
- Assignees
- 74
- Inventors
- 303
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 4 |
| 2003 | 2 | 1 |
| 2004 | 2 | 1 |
| 2005 | 2 | 5 |
| 2006 | 0 | 1 |
| 2007 | 3 | 4 |
| 2008 | 0 | 2 |
| 2009 | 2 | 6 |
| 2010 | 1 | 4 |
| 2011 | 1 | 4 |
| 2012 | 1 | 2 |
| 2013 | 1 | 4 |
| 2014 | 0 | 3 |
| 2015 | 3 | 4 |
| 2016 | 2 | 10 |
| 2017 | 4 | 5 |
| 2018 | 7 | 5 |
| 2019 | 7 | 5 |
| 2020 | 3 | 4 |
| 2021 | 6 | 8 |
| 2022 | 4 | 2 |
| 2023 | 2 | 3 |
| 2024 | 2 | 7 |
| 2025 | 6 | 1 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Direct flame preheating section for a continuous metal strip processing line31 Mar 2026US 12,590,761 B2Fives Stein
- Direct flame burner unit for furnaces for the thermo-chemical treatment of steel strips in continuous hot-dip galvanizing plants23 Dec 2025US 12,504,165 B2Tenova S. P. A.
- Annealing method16 Dec 2025US 12,497,678 B2ArcelorMittal
- Hot-rolled steel sheet and method for manufacturing same30 Sep 2025US 12,428,694 B2Nippon Steel Corporation
- Method for manufacturing steel sheet for cold press and method for manufacturing press component15 Jul 2025US 12,359,276 B2Jfe Steel Corporation
- Method for heating a steel intermediate strip when producing a flat steel strip23 Jul 2026US 2026/0210634 A1Primetals Technologies Austria GmbH
- Thermal treatment device, method and use2 Jul 2026US 2026/0185177 A1SMS group GmbH
- Jet-type direct-fired preheating system26 Mar 2026US 2026/0085374 A1Baoshan Iron & Steel Co., Ltd.
- Method for setting an oven atmosphere in a heat-treatment oven15 Jan 2026US 2026/0016230 A1ThyssenKrupp Steel Europe AG
- Method for heating steel sheet, method for producing coated steel sheet, direct fired furnace, and continuous hot-dip galvanizing facility25 Dec 2025US 2025/0388989 A1Jfe Steel Corporation
Most cited
By later US patents
- Apparatus for producing strip of stainless steel31US 5,904,204 ANippon Steel Corporation · 1999
- Method of heat treating metal castings, removing cores, and incinerating waste gasses28US 5,439,045 AConsolidated Engineering Company, Inc. · 1995
- Methods and apparatus for heat treatment and sand removal for castings21US 6,672,367 B2Consolidated Engineering Company, Inc. · 2004
- Fluid-fuel furnace burner for iron and steel products12US 6,334,770 B12002
- Method of operating continuous heat treatment furnace for metal strip coils11US 4,406,618 AKawasaki Steel Corporation · 1983