C21D 3/00
Diffusion processes for extraction of non-metals
Official title: Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings C21D1/72)
C21D3/00 (Diffusion processes for extraction of non-metals) appears on 313 US grants and 326 published applications in this corpus.
Search patents in C21D- Granted patents
- 313
- Published applications
- 326
- Assignees
- 133
- Inventors
- 829
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 5 | 0 |
| 1991 | 8 | 0 |
| 1992 | 1 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 7 | 0 |
| 1998 | 16 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 8 | 3 |
| 2003 | 4 | 7 |
| 2004 | 3 | 1 |
| 2005 | 2 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 4 |
| 2009 | 0 | 6 |
| 2010 | 0 | 3 |
| 2011 | 2 | 4 |
| 2012 | 3 | 3 |
| 2013 | 5 | 8 |
| 2014 | 2 | 4 |
| 2015 | 1 | 8 |
| 2016 | 7 | 20 |
| 2017 | 4 | 18 |
| 2018 | 13 | 14 |
| 2019 | 15 | 16 |
| 2020 | 8 | 18 |
| 2021 | 16 | 19 |
| 2022 | 19 | 46 |
| 2023 | 16 | 39 |
| 2024 | 25 | 33 |
| 2025 | 37 | 22 |
| 2026 | 17 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wound core22 Sep 2026US 12,744,149 B2Nippon Steel Corporation
- Wound core25 Aug 2026US 12,718,977 B2Nippon Steel Corporation
- Dehydrogenation method for steel material and steel product, and production method for steel material and steel product21 Jul 2026US 12,686,896 B2Jfe Steel Corporation
- Method for producing grain-oriented electrical steel sheet14 Jul 2026US 12,680,149 B2Jfe Steel Corporation
- Method for producing grain-oriented electrical steel sheet23 Jun 2026US 12,662,724 B2Jfe Steel Corporation
- Steel sheet and method for manufacturing steel sheet10 Sep 2026US 2026/0265889 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Hot stamping component and manufacturing method therefor27 Aug 2026US 2026/0249342 A1Hyundai Steel Company
- High-magnetic-induction grain-oriented silicon steel and preparation method thereof20 Aug 2026US 2026/0242887 A1Shougang Zhixin Electromagnetic Materials (Qian'an) Co., Ltd.
- Hot-stamping formed body13 Aug 2026US 2026/0234768 A1Nippon Steel Corporation
- Steel wire rod for tirecord having excellent drawability, preparation method therefor, and tirecord prepared by using same13 Aug 2026US 2026/0234771 A1Hyundai Steel Company
Most cited
By later US patents
- Surface-refined sintered alloy body and method for making the same60US 4,830,930 AToshiba Tungaloy Co., Ltd. · 1989
- Surface decarburization of a drill bit51US 5,609,447 ARogers Tool Works, Inc. · 1997
- Bit allocation method for controlling transmission rate of video encoder41US 5,532,746 AKorea Telecommunication Authority · 1996
- Controlling the oxygen content in tantalum material38US 4,960,471 ACabot Corporation · 1990
- Method of baking treatment of steel product parts37US 6,855,217 B2Aoyama Seisakusho Co., Ltd. · 2005