C21D 3/08
Extraction of nitrogen
C21D3/08 (Extraction of nitrogen) appears on 16 US grants and 15 published applications in this corpus.
Search patents in C21D- Granted patents
- 16
- Published applications
- 15
- Assignees
- 12
- Inventors
- 52
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 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 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 4 |
| 2021 | 2 | 3 |
| 2022 | 4 | 1 |
| 2023 | 0 | 1 |
| 2024 | 2 | 0 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Soft magnetic iron sheet, method for producing soft magnetic iron sheet, and, iron core and dynamo-electric machine, each using soft magnetic iron sheet30 Dec 2025US 12,512,239 B2Hitachi, Ltd.
- Fabrication method for a component having magnetic and non-magnetic dual phases12 Mar 2024US 11,926,880 B2General Electric Company
- Base sheet for grain-oriented electrical steel sheet, grain-oriented silicon steel sheet which is used as material of base sheet for grain-oriented electrical steel sheet, method of manufacturing base sheet for grain-oriented electrical steel sheet, and method of manufacturing grain-oriented electrical steel sheet30 Jan 2024US 11,884,988 B2Nippon Steel Corporation
- FeNi ordered alloy, FeNi ordered alloy magnet, and method for manufacturing FeNi ordered alloy30 Aug 2022US 11,427,895 B2Denso Corporation
- Gold-colored steel sheet and manufacturing method thereof24 May 2022US 11,339,459 B2Posco
- Method for manufacturing high-chromium (cr) molten steel, method for manufacturing cast piece, and method for manufacturing press roll16 Apr 2026US 2026/0103769 A1Posco
- Soft Magnetic Iron Sheet, Method for Producing Soft Magnetic Iron Sheet, and, Iron Core and Dynamo-Electric Machine, Each Using Soft Magnetic Iron Sheet14 Sep 2023US 2023/0290551 A1Hitachi, Ltd.
- Fabrication method for a component having magnetic & non-magnetic dual phases27 Oct 2022US 2022/0340987 A1General Electric Company
- Base sheet for grain-oriented electrical steel sheet, grain-oriented silicon steel sheet which is used as material of base sheet for grain-oriented electrical steel sheet, method of manufacturing base sheet for grain-oriented electrical steel sheet, and method of manufacturing grain-oriented electrical steel sheet14 Oct 2021US 2021/0317542 A1Nippon Steel Corporation
- Method for refining magnetic domains of grain-oriented electrical steel sheet6 May 2021US 2021/0130922 A1Posco
Most cited
By later US patents
- Subscale reaction strengthening of low carbon ferrous metal stock3US 3,998,666 AUnited States Steel Corporation · 1976
- Method for decreasing the amount of carbon and nitrogen contained in the ferrochrome alloy3US 4,050,960 ANippon Steel Corporation · 1977
- Apparatus for removing gases from particles3US 4,175,921 AAllegheny Ludlum Industries, Inc. · 1979
- Finish heat treatment method and finish heat treatment apparatus for iron powder1US 9,321,103 B2Jfe Steel Corporation · 2016