C21D 1/78
Combined heat-treatments not provided for above
C21D1/78 (Combined heat-treatments not provided for above) appears on 193 US grants and 185 published applications in this corpus.
Search patents in C21D- Granted patents
- 193
- Published applications
- 185
- Assignees
- 145
- Inventors
- 578
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 12 | 0 |
| 2002 | 4 | 3 |
| 2003 | 6 | 2 |
| 2004 | 0 | 8 |
| 2005 | 2 | 9 |
| 2006 | 2 | 4 |
| 2007 | 4 | 7 |
| 2008 | 3 | 8 |
| 2009 | 4 | 9 |
| 2010 | 8 | 5 |
| 2011 | 3 | 1 |
| 2012 | 5 | 6 |
| 2013 | 2 | 2 |
| 2014 | 1 | 6 |
| 2015 | 1 | 4 |
| 2016 | 3 | 6 |
| 2017 | 3 | 6 |
| 2018 | 3 | 4 |
| 2019 | 5 | 8 |
| 2020 | 3 | 7 |
| 2021 | 10 | 10 |
| 2022 | 9 | 23 |
| 2023 | 4 | 19 |
| 2024 | 8 | 13 |
| 2025 | 27 | 10 |
| 2026 | 11 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High strength steel sheet having excellent workability and method for manufacturing same25 Aug 2026US 12,716,110 B2Posco
- Method of heat treating a steel component18 Aug 2026US 12,709,781 B2Aktiebolaget Skf
- Method for producing a screw, and screw2 Jun 2026US 12,644,162 B2EJOT GmbH & Co. KG
- Carbon steel and austenitic stainless steel rolling clad plate manufacturing method therefor19 May 2026US 12,629,766 B2Baoshan Iron & Steel Co., Ltd.
- Steel sheet, member, and method for producing them12 May 2026US 12,624,410 B2Jfe Steel Corporation
- Automotive vehicle with press hardened visible steel parts3 Sep 2026US 2026/0257735 A1
- Steel material suitable for use in sour environment23 Jul 2026US 2026/0209910 A1Nippon Steel Corporation
- Steel sheet plated with al-fe alloy for hot press forming having exellent corrosion resistance and heat resistance, hot press formed part, and manufacturing method therefor14 May 2026US 2026/0132496 A1Posco
- Cold-rolled steel sheet and method for manufacturing same7 May 2026US 2026/0125774 A1Hyundai Steel Company
- Method for manufacturing laminated iron core and heating device12 Feb 2026US 2026/0042277 A1Mitsui High-Tec, Inc.
Most cited
By later US patents
- Method of manufacturing case-hardened parts with little distortion in heat treatment and superior strength in bending fatigue34US 5,595,610 AKabushiki Kaisha Kobe Seiko Sho · 1997
- Method and apparatus for carburizing, quenching and tempering30US 5,868,871 ADowa Mining Co., Ltd. · 1999
- Rolling element and producing method29US 6,309,475 B1Komatsu Ltd. · 2001
- High tensile hot-dip zinc-coated steel plate excellent in ductility and method for production thereof27US 6,423,426 B1Kawasaki Steel Corporation · 2002
- Ball-and-roller bearing system25US 4,904,094 ANippon Seiko Kabushiki Kaisha · 1990