C21D 6/00
Heat treatment of ferrous alloys
C21D6/00 (Heat treatment of ferrous alloys) appears on 3,515 US grants and 5,416 published applications in this corpus.
Search patents in C21D- Granted patents
- 3,515
- Published applications
- 5,416
- Assignees
- 1,094
- Inventors
- 7,890
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 1 | 0 |
| 1978 | 9 | 0 |
| 1979 | 5 | 0 |
| 1980 | 7 | 0 |
| 1981 | 17 | 0 |
| 1982 | 11 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 14 | 0 |
| 1990 | 7 | 0 |
| 1991 | 13 | 0 |
| 1992 | 15 | 0 |
| 1993 | 21 | 0 |
| 1994 | 11 | 0 |
| 1995 | 16 | 0 |
| 1996 | 15 | 0 |
| 1997 | 20 | 0 |
| 1998 | 23 | 0 |
| 1999 | 34 | 0 |
| 2000 | 29 | 0 |
| 2001 | 29 | 7 |
| 2002 | 36 | 37 |
| 2003 | 40 | 39 |
| 2004 | 35 | 49 |
| 2005 | 14 | 28 |
| 2006 | 7 | 35 |
| 2007 | 15 | 40 |
| 2008 | 14 | 58 |
| 2009 | 17 | 79 |
| 2010 | 40 | 109 |
| 2011 | 42 | 90 |
| 2012 | 58 | 104 |
| 2013 | 46 | 149 |
| 2014 | 66 | 141 |
| 2015 | 80 | 297 |
| 2016 | 102 | 333 |
| 2017 | 148 | 261 |
| 2018 | 206 | 336 |
| 2019 | 248 | 383 |
| 2020 | 229 | 365 |
| 2021 | 261 | 357 |
| 2022 | 315 | 457 |
| 2023 | 259 | 449 |
| 2024 | 271 | 462 |
| 2025 | 380 | 381 |
| 2026 | 249 | 370 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Forged steel roll for cold rolling6 Oct 2026US 12,752,325 B2Nippon Steel Corporation
- Ultra-high strength cold rolled steel sheet having excellent bendability, and method of manufacturing same6 Oct 2026US 12,753,455 B2Posco
- High-strength electrogalvannealed steel sheet and method for manufacturing the same6 Oct 2026US 12,753,456 B2Jfe Steel Corporation
- Annealing separator composition for grain- oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet6 Oct 2026US 12,753,457 B2Posco
- Hot rolled high strength steel strip having high hole expansion ratio6 Oct 2026US 12,753,461 B2Tata Steel Ijmuiden B.V.
- Steel plate and method for manufacturing same8 Oct 2026US 2026/0308708 A1Posco
- Hydrogen induced cracking-resistant cold-rolled hot-dip galvanized ultra-high-strength dual-phase steel and manufacturing method therefor8 Oct 2026US 2026/0308732 A1Baoshan Iron & Steel Co., Ltd.
- System and method to produce rolled green steel products with very low ghg emission intensity1 Oct 2026US 2026/0297701 A1Saarloha Advanced Materials Private Limited
- High strength steel sheet, high strength coated steel sheet, methods for producing the same, and member1 Oct 2026US 2026/0297712 A1Jfe Steel Corporation
- Coated steel sheet, member, and methods for producing the same1 Oct 2026US 2026/0297713 A1Jfe Steel Corporation
Most cited
By later US patents
- Time sequenced heating of multiple layers in a hydrocarbon containing formation225US 7,635,023 B2Shell Oil Company · 2009
- Temperature limited heaters using phase transformation of ferromagnetic material186US 7,597,147 B2Shell Oil Company · 2009
- Wellhead with non-ferromagnetic materials184US 7,533,719 B2Shell Oil Company · 2009
- Compositions produced using an in situ heat treatment process172US 7,604,052 B2Shell Oil Company · 2009
- Sour gas injection for use with in situ heat treatment163US 7,610,962 B2Shell Oil Company · 2009