C21D 8/1277
Involving a particular surface treatment
Official title: involving a particular surface treatment (C21D8/1294 takes precedence)
C21D8/1277 (Involving a particular surface treatment) appears on 551 US grants and 693 published applications in this corpus.
Search patents in C21D- Granted patents
- 551
- Published applications
- 693
- Assignees
- 100
- Inventors
- 889
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 6 | 0 |
| 1992 | 11 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 12 | 0 |
| 1999 | 7 | 0 |
| 2000 | 5 | 0 |
| 2001 | 8 | 0 |
| 2002 | 6 | 8 |
| 2003 | 9 | 14 |
| 2004 | 9 | 9 |
| 2005 | 5 | 6 |
| 2006 | 6 | 3 |
| 2007 | 4 | 2 |
| 2008 | 8 | 6 |
| 2009 | 1 | 6 |
| 2010 | 1 | 6 |
| 2011 | 9 | 11 |
| 2012 | 9 | 13 |
| 2013 | 6 | 25 |
| 2014 | 9 | 19 |
| 2015 | 8 | 26 |
| 2016 | 7 | 29 |
| 2017 | 17 | 18 |
| 2018 | 21 | 40 |
| 2019 | 18 | 27 |
| 2020 | 20 | 35 |
| 2021 | 32 | 34 |
| 2022 | 33 | 92 |
| 2023 | 34 | 56 |
| 2024 | 55 | 64 |
| 2025 | 64 | 78 |
| 2026 | 31 | 66 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Non-oriented electrical steel sheet, method for producing same, and hot-rolled steel sheet22 Sep 2026US 12,742,223 B2Nippon Steel Corporation
- Powder for annealing separator and method of producing same, and method of producing grain-oriented electrical steel sheet8 Sep 2026US 12,729,410 B2Jfe 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
- Method for producing grain-oriented electrical steel sheet1 Sep 2026US 12,723,288 B2Nippon Steel Corporation
- 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 for producing a super low watt loss grain oriented electrical steel sheet40US 3,932,236 ANippon Steel Corporation · 1976
- Extra-low iron loss grain oriented silicon steel sheets24US 4,698,272 AKawasaki Steel Corporation · 1987
- Inorganic/organic insulating coating for nonoriented electrical steel24US 5,955,201 AArmco Inc. · 1999
- Process for production of grain oriented electrical steel sheet having excellent magnetic properties22US 5,512,110 ANippon Steel Corporation · 1996
- Grain oriented silicon steel sheet having excellent primary film properties21US 5,565,272 ANippon Steel Corporation · 1996