C21D 8/1238
Flattening
Official title: {Flattening; Dressing; Flexing}
C21D8/1238 (Flattening) appears on 25 US grants and 44 published applications in this corpus.
Search patents in C21D- Granted patents
- 25
- Published applications
- 44
- Assignees
- 19
- Inventors
- 109
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 0 | 1 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 2 |
| 2020 | 0 | 0 |
| 2021 | 2 | 2 |
| 2022 | 1 | 7 |
| 2023 | 2 | 5 |
| 2024 | 5 | 11 |
| 2025 | 8 | 5 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Production method for grain-oriented electrical steel sheet2 Jun 2026US 12,644,164 B2Nippon Steel Corporation
- Fe—Co-based alloy bar13 Jan 2026US 12,522,899 B2Proterial, Ltd.
- Fe-Co-based alloy bar13 Jan 2026US 12,522,900 B2Proterial, Ltd.
- Preparation method of glassless grain-oriented silicon steel and product thereof16 Sep 2025US 12,416,059 B2Shougang Zhixin Electromagnetic Materials (Qian'an) Co., Ltd.
- Method for manufacturing a grain-oriented electrical steel sheet10 Jun 2025US 12,325,892 B2Jfe Steel Corporation
- Non-oriented electrical steel plate with high magnetic induction and manufacturing method thereof8 Oct 2026US 2026/0308707 A1Baoshan Iron & Steel Co., Ltd.
- Grain-oriented electrical steel sheet and method for forming insulating coating20 Aug 2026US 2026/0242905 A1Nippon Steel Corporation
- Non-oriented electrical steel sheet, motor core, and motor13 Aug 2026US 2026/0234763 A1Nippon Steel Corporation
- Non-oriented electrical steel sheet23 Jul 2026US 2026/0213050 A1Nippon Steel Corporation
- Non-oriented electrical steel sheet, core, and rotary electric machine23 Apr 2026US 2026/0110070 A1Nippon Steel Corporation
Most cited
By later US patents
- Thermal flattening semi-processed electrical steel8US 5,096,510 AArmco Inc. · 1992
- Method and device for continuous annealing metallic ribbons with improved process efficiency7US 6,830,634 B2Sensormatic Electronics Corporation · 2004
- Skin pass rolling of mechanically scribed silicon steel3US 5,312,496 AAllegheny Ludlum Corporation · 1994
- Method for improving the magnetic permeability of grain oriented silicon steel2US 4,482,397 AAllegheny Ludlum Steel Corporation · 1984
- Method and device for magnetic domain refinement of oriented electrical steel plate1US 11,000,920 B2Posco · 2021