C21D 8/0221
Characterised by the working steps
Official title: characterised by the working steps
C21D8/0221 (Characterised by the working steps) appears on 2,435 US grants and 3,669 published applications in this corpus.
Search patents in C21D- Granted patents
- 2,435
- Published applications
- 3,669
- Assignees
- 493
- Inventors
- 4,934
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 11 | 0 |
| 1978 | 11 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 11 | 0 |
| 1984 | 7 | 0 |
| 1985 | 10 | 0 |
| 1986 | 12 | 0 |
| 1987 | 3 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 8 | 0 |
| 1996 | 17 | 0 |
| 1997 | 10 | 0 |
| 1998 | 16 | 0 |
| 1999 | 17 | 0 |
| 2000 | 25 | 0 |
| 2001 | 40 | 11 |
| 2002 | 20 | 45 |
| 2003 | 50 | 47 |
| 2004 | 38 | 50 |
| 2005 | 14 | 27 |
| 2006 | 15 | 23 |
| 2007 | 4 | 17 |
| 2008 | 5 | 21 |
| 2009 | 18 | 35 |
| 2010 | 17 | 60 |
| 2011 | 25 | 41 |
| 2012 | 19 | 45 |
| 2013 | 26 | 106 |
| 2014 | 29 | 111 |
| 2015 | 52 | 158 |
| 2016 | 47 | 181 |
| 2017 | 101 | 201 |
| 2018 | 118 | 193 |
| 2019 | 167 | 231 |
| 2020 | 143 | 276 |
| 2021 | 166 | 249 |
| 2022 | 239 | 330 |
| 2023 | 162 | 348 |
| 2024 | 207 | 333 |
| 2025 | 286 | 254 |
| 2026 | 210 | 276 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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
- Steel sheet with excellent phosphatability and manufacturing method therefor6 Oct 2026US 12,753,458 B2Posco
- Hot rolled high strength steel strip having high hole expansion ratio6 Oct 2026US 12,753,461 B2Tata Steel Ijmuiden B.V.
- Method of manufacturing grain-oriented electrical steel sheet and hot-rolled steel sheet for grain-oriented electrical steel sheet6 Oct 2026US 12,753,471 B2Jfe Steel Corporation
- A cold rolled martensitic steel and a method of martensitic steel thereof8 Oct 2026US 2026/0308706 A1
- 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
Most cited
By later US patents
- Tear resistant gelatinous elastomer compositions and articles for use as fishing bait86US 6,794,440 B2Applied Elastomerics, Inc. · 2004
- Steel plate having superior toughness in weld heat-affected zone and welded structure made therefrom84US 7,105,066 B2Posco · 2006
- High strength steel sheet having excellent formability and method for production thereof66US 7,090,731 B2Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) · 2006
- Flat product, such as sheet, made of steel having a high yield strength and exhibiting good ductility and process for manufacturing this product53US 6,395,108 B2Recherche et Developpement du Groupe Cockerill Sambre · 2002
- Process for the production of clad hot rolled strip and the resulting product44US 4,917,969 AThyssen Stahl AG · 1990