C21D 9/56
Continuous furnaces for strip or wire
C21D9/56 (Continuous furnaces for strip or wire) appears on 940 US grants and 728 published applications in this corpus.
Search patents in C21D- Granted patents
- 940
- Published applications
- 728
- Assignees
- 440
- Inventors
- 2,311
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 19 | 0 |
| 1978 | 14 | 0 |
| 1979 | 13 | 0 |
| 1980 | 15 | 0 |
| 1981 | 14 | 0 |
| 1982 | 19 | 0 |
| 1983 | 26 | 0 |
| 1984 | 26 | 0 |
| 1985 | 17 | 0 |
| 1986 | 19 | 0 |
| 1987 | 19 | 0 |
| 1988 | 29 | 0 |
| 1989 | 19 | 0 |
| 1990 | 15 | 0 |
| 1991 | 12 | 0 |
| 1992 | 12 | 0 |
| 1993 | 22 | 0 |
| 1994 | 17 | 0 |
| 1995 | 15 | 0 |
| 1996 | 11 | 0 |
| 1997 | 21 | 0 |
| 1998 | 21 | 0 |
| 1999 | 18 | 0 |
| 2000 | 15 | 0 |
| 2001 | 19 | 6 |
| 2002 | 16 | 19 |
| 2003 | 14 | 16 |
| 2004 | 13 | 15 |
| 2005 | 11 | 9 |
| 2006 | 3 | 17 |
| 2007 | 6 | 17 |
| 2008 | 9 | 15 |
| 2009 | 11 | 25 |
| 2010 | 9 | 32 |
| 2011 | 9 | 21 |
| 2012 | 7 | 19 |
| 2013 | 20 | 28 |
| 2014 | 19 | 23 |
| 2015 | 18 | 36 |
| 2016 | 18 | 41 |
| 2017 | 25 | 40 |
| 2018 | 23 | 34 |
| 2019 | 40 | 38 |
| 2020 | 28 | 52 |
| 2021 | 30 | 42 |
| 2022 | 39 | 35 |
| 2023 | 33 | 47 |
| 2024 | 28 | 43 |
| 2025 | 38 | 30 |
| 2026 | 18 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C21D 9/573With cooling351
- C21D 9/561With a controlled atmosphere or vacuum180
- C21D 9/562Details175
- C21D 9/60With induction heating141
- C21D 9/63The strip being supported by a cushion of gas45
- C21D 9/62With direct resistance heating42
- C21D 9/58With heating by baths17
- C21D 9/567With heating in fluidised beds9
Recent patents
- Energy-efficient production of a ferritic hot-rolled strip in an integrated casting-rolling plant14 Jul 2026US 12,680,144 B2Primetals Technologies Austria GmbH
- Steel sheet, member, and methods for producing the same26 May 2026US 12,637,730 B2Jfe Steel Corporation
- Method for producing a dual-phase steel strip in a combined casting and rolling system, a dual-phase steel strip produced by means of the method, and a combined casting and rolling system19 May 2026US 12,629,747 B2Primetals Technologies Austria GmbH
- Methods of cooling an electrically conductive sheet during transverse flux induction heat treatment19 May 2026US 12,635,041 B2Arconic Technologies LLC
- Method for producing a microalloyed steel, a microalloyed steel produced using the method, and a combined casting/rolling installation12 May 2026US 12,623,278 B2Primetals Technologies Austria GmbH
- An annealing apparatus for a metal strip coating system17 Sep 2026US 2026/0275448 A1Danieli & C. Officine Meccaniche SpA
- High-strength and high-plasticity hot-rolled strip steel with high weather resistance and manufacturing method therefor3 Sep 2026US 2026/0258536 A1Baoshan Iron & Steel Co., Ltd.
- Hot-dip coated steel sheet, frame, and method for manufacturing hot-dip coated steel sheet20 Aug 2026US 2026/0242919 A1Nippon Steel Corporation
- Method for predicting sheet temperature of steel strip, method for controlling sheet temperature of steel strip, steel strip production method, and method for generating steel strip sheet temperature prediction model13 Aug 2026US 2026/0234745 A1Jfe Steel Corporation
- Continuous annealing line, continuous annealing method, method of producing cold-rolled steel sheet, and method of producing coated or plated steel sheet30 Jul 2026US 2026/0218361 A1Jfe Steel Corporation
Most cited
By later US patents
- Coating system for glass adhesion retention46US 5,664,041 ADSM Desotech, Inc. · 1997
- Method of working metal, metal body obtained by the method and metal-containing ceramic body obtained by the method46US 7,559,221 B2Rinascimetalli Ltd. · 2009
- Multi-wire induction heating42US 4,788,394 ANV Bekaert SA · 1988
- Electromagnetic induction heating apparatus including a magnetic flux diverting assembly40US 4,795,872 ANippon Light Metal Company, Ltd. · 1989
- Method and device for plasma treatment of moving metal substrates39US 6,933,460 B22005