C21D 6/02
Hardening by precipitation
C21D6/02 (Hardening by precipitation) appears on 355 US grants and 472 published applications in this corpus.
Search patents in C21D- Granted patents
- 355
- Published applications
- 472
- Assignees
- 222
- Inventors
- 1,220
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 10 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 1 |
| 2002 | 6 | 7 |
| 2003 | 13 | 11 |
| 2004 | 7 | 9 |
| 2005 | 5 | 2 |
| 2006 | 1 | 6 |
| 2007 | 4 | 6 |
| 2008 | 2 | 8 |
| 2009 | 1 | 10 |
| 2010 | 3 | 24 |
| 2011 | 6 | 16 |
| 2012 | 10 | 11 |
| 2013 | 7 | 12 |
| 2014 | 11 | 11 |
| 2015 | 11 | 25 |
| 2016 | 8 | 29 |
| 2017 | 12 | 22 |
| 2018 | 23 | 25 |
| 2019 | 28 | 34 |
| 2020 | 17 | 29 |
| 2021 | 23 | 24 |
| 2022 | 22 | 39 |
| 2023 | 16 | 48 |
| 2024 | 14 | 24 |
| 2025 | 34 | 23 |
| 2026 | 14 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing austenitic heat resistant steel16 Jun 2026US 12,655,490 B2Nippon Steel Corporation
- Low density hot rolled steel, method of production thereof and use of such steel to produce vehicle parts16 Jun 2026US 12,655,497 B2ArcelorMittal
- Non-heat treated wire rod with excellent wire drawability and impact toughness and manufacturing method therefor26 May 2026US 12,637,747 B2Posco
- High-strength steel sheet and method for producing same19 May 2026US 12,630,895 B2Jfe Steel Corporation
- Method for producing high-strength steel parts with improved ductility, and parts obtained by said method19 May 2026US 12,630,897 B2ArcelorMittal
- Cold-rolled steel material and method for producing same10 Sep 2026US 2026/0265853 A1Hyundai Steel Company
- Press hardened steel part having high-strength and improved ductility27 Aug 2026US 2026/0250797 A1
- Steel for knives20 Aug 2026US 2026/0242886 A1Proterial, Ltd.
- Hot rolled and steel sheet and a method of manufacturing thereof13 Aug 2026US 2026/0234774 A1
- Stainless steel material suitable for casting and shaping30 Jul 2026US 2026/0218355 A1Solas Science & Engineering Co., Ltd.
Most cited
By later US patents
- Heat treated stainless steel needles85US 5,533,982 AUnited States Surgical Corporation · 1996
- Welding high-strength nickel base superalloys60US 5,374,319 AChromalloy Gas Turbine Corporation · 1994
- Low alloy steel for oil country tubular goods and method of making57US 6,267,828 B12001
- Welding high-strength nickel base superalloys49US 5,106,010 AChromalloy Gas Turbine Corporation · 1992
- Fe-ni alloy having high strength and low thermal expansion, a shadow mask made of the alloy, a braun tube with the shadow mask, a lead frame made of the alloy and a semiconductor element with lead frame46US 6,592,810 B2Hitachi Metals, Ltd. · 2003