C21D 8/00
Modifying the physical properties of ferrous metals or ferrous alloys by deformation
Official title: Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)
C21D8/00 (Modifying the physical properties of ferrous metals or ferrous alloys by deformation) appears on 6,355 US grants and 7,950 published applications in this corpus.
Search patents in C21D- Granted patents
- 6,355
- Published applications
- 7,950
- Assignees
- 1,344
- Inventors
- 11,208
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 63 | 0 |
| 1977 | 48 | 0 |
| 1978 | 47 | 0 |
| 1979 | 23 | 0 |
| 1980 | 27 | 0 |
| 1981 | 30 | 0 |
| 1982 | 39 | 0 |
| 1983 | 57 | 0 |
| 1984 | 34 | 0 |
| 1985 | 44 | 0 |
| 1986 | 58 | 0 |
| 1987 | 37 | 0 |
| 1988 | 49 | 0 |
| 1989 | 51 | 0 |
| 1990 | 66 | 0 |
| 1991 | 60 | 0 |
| 1992 | 65 | 0 |
| 1993 | 64 | 0 |
| 1994 | 57 | 0 |
| 1995 | 61 | 0 |
| 1996 | 62 | 0 |
| 1997 | 72 | 0 |
| 1998 | 80 | 0 |
| 1999 | 73 | 0 |
| 2000 | 78 | 0 |
| 2001 | 113 | 26 |
| 2002 | 105 | 108 |
| 2003 | 123 | 133 |
| 2004 | 99 | 134 |
| 2005 | 53 | 82 |
| 2006 | 40 | 85 |
| 2007 | 32 | 81 |
| 2008 | 54 | 102 |
| 2009 | 44 | 161 |
| 2010 | 66 | 202 |
| 2011 | 103 | 179 |
| 2012 | 95 | 188 |
| 2013 | 99 | 276 |
| 2014 | 139 | 321 |
| 2015 | 166 | 401 |
| 2016 | 145 | 403 |
| 2017 | 266 | 412 |
| 2018 | 269 | 447 |
| 2019 | 348 | 462 |
| 2020 | 327 | 492 |
| 2021 | 346 | 476 |
| 2022 | 433 | 615 |
| 2023 | 315 | 597 |
| 2024 | 387 | 614 |
| 2025 | 507 | 491 |
| 2026 | 336 | 462 |
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
- High strength steel sheet and method of producing same6 Oct 2026US 12,753,454 B2Jfe Steel Corporation
- Ultra-high strength cold rolled steel sheet having excellent bendability, and method of manufacturing same6 Oct 2026US 12,753,455 B2Posco
- 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
- Steel sheet with excellent phosphatability and manufacturing method therefor6 Oct 2026US 12,753,458 B2Posco
- A cold rolled martensitic steel and a method of martensitic steel thereof8 Oct 2026US 2026/0308706 A1
- Non-oriented electrical steel plate with high magnetic induction and manufacturing method thereof8 Oct 2026US 2026/0308707 A1Baoshan Iron & Steel Co., Ltd.
- Steel plate and method for manufacturing same8 Oct 2026US 2026/0308708 A1Posco
- Martensitic stainless steel strip8 Oct 2026US 2026/0308709 A1Proterial, Ltd.
- 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.
Most cited
By later US patents
- Multilayer composite tubular structure and method of making381US 5,858,556 AUti Inc. · 1999
- Suturing with corrosion and breakage resistant flexible wire192US 5,333,625 A1994
- Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment151US 6,296,805 B1Sollac · 2001
- Magnetically coded device145US 5,631,093 AGeneral Motors Corporation · 1997
- Structures having enhanced biaxial texture and method of fabricating same110US 5,741,377 AMartin Marietta Energy Systems, Inc. · 1998