C21D 8/1222
Hot rolling
Official title: {Hot rolling}
C21D8/1222 (Hot rolling) appears on 487 US grants and 675 published applications in this corpus.
Search patents in C21D- Granted patents
- 487
- Published applications
- 675
- Assignees
- 91
- Inventors
- 857
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 12 | 0 |
| 1992 | 7 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 1 |
| 2002 | 11 | 6 |
| 2003 | 8 | 8 |
| 2004 | 7 | 5 |
| 2005 | 4 | 9 |
| 2006 | 3 | 1 |
| 2007 | 4 | 2 |
| 2008 | 4 | 2 |
| 2009 | 1 | 3 |
| 2010 | 3 | 3 |
| 2011 | 2 | 5 |
| 2012 | 3 | 8 |
| 2013 | 3 | 13 |
| 2014 | 3 | 17 |
| 2015 | 4 | 36 |
| 2016 | 8 | 16 |
| 2017 | 21 | 20 |
| 2018 | 18 | 27 |
| 2019 | 16 | 37 |
| 2020 | 13 | 44 |
| 2021 | 41 | 48 |
| 2022 | 40 | 81 |
| 2023 | 37 | 56 |
| 2024 | 45 | 80 |
| 2025 | 55 | 72 |
| 2026 | 46 | 75 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Non-oriented electrical steel sheet, method for producing same, and hot-rolled steel sheet22 Sep 2026US 12,742,223 B2Nippon Steel Corporation
- Wound core22 Sep 2026US 12,744,149 B2Nippon Steel Corporation
- Double-oriented electrical steel sheet, and method for producing same8 Sep 2026US 12,729,411 B2Posco
- Method for manufacturing grain-oriented electrical steel sheet8 Sep 2026US 12,729,412 B2Jfe Steel Corporation
- Non-oriented electrical steel sheet and method for manufacturing same8 Sep 2026US 12,729,418 B2Posco
- Non-oriented electrical steel plate with high magnetic induction and manufacturing method thereof8 Oct 2026US 2026/0308707 A1Baoshan Iron & Steel Co., Ltd.
- Annealing method for hot-rolled steel strip, and method for producing electrical steel sheet using such annealing method24 Sep 2026US 2026/0286461 A1Jfe Steel Corporation
- Grain-oriented electrical steel sheet and method for forming insulating coating17 Sep 2026US 2026/0275442 A1Nippon Steel Corporation
- High-strength and low-iron-loss non-oriented electrical steel plate and manufacturing method therefor17 Sep 2026US 2026/0275466 A1Baoshan Iron & Steel Co., Ltd.
- Grain-oriented electrical steel sheet and manufacturing method of grain-oriented electrical steel sheet17 Sep 2026US 2026/0275467 A1Nippon Steel Corporation
Most cited
By later US patents
- Method of producing grain-oriented magnetic steel sheet27US 5,885,371 AKawasaki Steel Corporation · 1999
- Permanent magnet manufacture from very low coercivity crystalline rare earth-transition metal-boron alloy23US 4,921,551 AGeneral Motors Corporation · 1990
- Grain oriented electrical steel having high volume resistivity and method for producing same18US 5,643,370 AArmco Inc. · 1997
- Electro magnetic steels17US 4,306,922 ABritish Steel Corporation · 1981
- Method for producing non-grain oriented magnetic sheet steel16US 6,503,339 B1Thyssen Krupp Stahl AG · 2003