C21D 8/1255
With diffusion of elements
Official title: {with diffusion of elements, e.g. decarburising, nitriding}
C21D8/1255 (With diffusion of elements) appears on 301 US grants and 367 published applications in this corpus.
Search patents in C21D- Granted patents
- 301
- Published applications
- 367
- Assignees
- 56
- Inventors
- 531
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 11 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 7 | 1 |
| 2002 | 7 | 6 |
| 2003 | 3 | 4 |
| 2004 | 3 | 3 |
| 2005 | 2 | 3 |
| 2006 | 0 | 1 |
| 2007 | 3 | 0 |
| 2008 | 2 | 1 |
| 2009 | 0 | 4 |
| 2010 | 0 | 2 |
| 2011 | 4 | 2 |
| 2012 | 5 | 9 |
| 2013 | 3 | 17 |
| 2014 | 3 | 6 |
| 2015 | 5 | 17 |
| 2016 | 6 | 17 |
| 2017 | 4 | 12 |
| 2018 | 9 | 22 |
| 2019 | 14 | 14 |
| 2020 | 10 | 13 |
| 2021 | 15 | 22 |
| 2022 | 16 | 64 |
| 2023 | 20 | 27 |
| 2024 | 37 | 32 |
| 2025 | 37 | 31 |
| 2026 | 15 | 37 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wound core22 Sep 2026US 12,744,149 B2Nippon Steel Corporation
- 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
- Soft magnetic material, method for producing soft magnetic material, and electric motor1 Sep 2026US 12,723,294 B2Hitachi, Ltd.
- Wound core25 Aug 2026US 12,718,977 B2Nippon Steel Corporation
- 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
- Grain-oriented electrical steel sheet and manufacturing method of grain-oriented electrical steel sheet17 Sep 2026US 2026/0275467 A1Nippon Steel Corporation
- Grain-oriented electrical steel sheet and method for forming insulating coating17 Sep 2026US 2026/0279628 A1Nippon Steel Corporation
- Grain-oriented electrical steel sheet and method for forming insulating coating17 Sep 2026US 2026/0279630 A1Nippon Steel Corporation
Most cited
By later US patents
- Method for treating at least one part of soft magnetic material to form a hard wear area39US 5,769,965 ARobert Bosch GmbH · 1998
- Process for producing grain-oriented electrical steel sheet having superior magnetic and surface film characteristics26US 4,979,997 ANippon Steel Corporation · 1990
- Process for production of grain oriented electrical steel sheet having excellent magnetic properties22US 5,512,110 ANippon Steel Corporation · 1996
- Ultra-rapid heat treatment of grain oriented electrical steel21US 4,898,626 AArmco Advanced Materials Corporation · 1990
- Grain-oriented electrical steel sheet and method of manufacturing the same20US 5,718,775 AKawasaki Steel Corporation · 1998