C21D 9/68
Furnace coilers
Official title: Furnace coilers; Hot coilers (cold coilers B21C47/00)
C21D9/68 (Furnace coilers) appears on 69 US grants and 36 published applications in this corpus.
Search patents in C21D- Granted patents
- 69
- Published applications
- 36
- Assignees
- 45
- Inventors
- 158
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 2 | 0 |
| 2008 | 0 | 3 |
| 2009 | 2 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 1 | 3 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 2 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 4 |
| 2019 | 0 | 3 |
| 2020 | 1 | 0 |
| 2021 | 3 | 3 |
| 2022 | 1 | 0 |
| 2023 | 1 | 6 |
| 2024 | 3 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High-strength wire rod having high hydrogen embrittlement resistance for cold heading, and method for manufacturing the same17 Mar 2026US 12,577,632 B2Posco
- Wire rod for cold heading having excellent delayed fracture resistance characteristics, parts, and manufacturing method therefor19 Aug 2025US 12,392,019 B2Posco
- Plasma apparatus for the production of high quality spherical powders at high capacity24 Dec 2024US 12,172,217 B2Pyrogenesis Canada Inc.
- Method for manufacturing cold-rolled or zinc-plated dual-phase steel plate over 980 MPa10 Sep 2024US 12,084,751 B2Baoshan Iron & Steel Co., Ltd.
- Method of producing a non-oriented electrical steel sheet2 Apr 2024US 11,946,123 B2Jfe Steel Corporation
- High-strength wire rod having high hydrogen embrittlement resistance for cold heading, and method for manufacturing the same23 Jul 2026US 2026/0209882 A1Posco
- Plasma apparatus for the production of high quality spherical powders at high capacity1 Jan 2026US 2026/0001129 A1Pyrogenesis Canada Inc.
- Wire rod for cold heading having excellent delayed fracture resistance characteristics, parts, and manufacturing method therefor20 Nov 2025US 2025/0354241 A1Posco
- Steel sheet and manufacturing method therefor13 Feb 2025US 2025/0051889 A1Posco
- Selective heat treatment of metals using a coil-in-furnace system1 Aug 2024US 2024/0254589 A1Raytheon Technologies Corporation
Most cited
By later US patents
- Making hot roller steel strip from continuously cast ingots29US 4,698,897 AMannesmann Aktiengesellschaft · 1987
- Continuous rolling method and apparatus24US 4,630,352 ATippins Machinery Company, Inc. · 1986
- Installation for the manufacture of hot-rolled steel strip14US 5,335,713 AMannesmann Aktiengesellschaft · 1994
- Method of operating a wide band hot rolling mill13US 4,263,798 AHoesch Werke Aktiengesellschaft · 1981
- Coiler-furnace combination13US 4,442,690 AVoest-Alpine Aktiengesellschaft · 1984