C21D 1/25
Hardening, combined with annealing between 300 degrees celsius and 600 degrees celsius
Official title: Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
C21D1/25 (Hardening, combined with annealing between 300 degrees celsius and 600 degrees celsius) appears on 431 US grants and 708 published applications in this corpus.
Search patents in C21D- Granted patents
- 431
- Published applications
- 708
- Assignees
- 205
- Inventors
- 1,387
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 0 |
| 2003 | 2 | 2 |
| 2004 | 3 | 3 |
| 2005 | 0 | 3 |
| 2006 | 0 | 6 |
| 2007 | 1 | 9 |
| 2008 | 0 | 6 |
| 2009 | 3 | 15 |
| 2010 | 2 | 16 |
| 2011 | 6 | 27 |
| 2012 | 19 | 23 |
| 2013 | 13 | 21 |
| 2014 | 6 | 20 |
| 2015 | 20 | 19 |
| 2016 | 13 | 31 |
| 2017 | 12 | 31 |
| 2018 | 22 | 27 |
| 2019 | 31 | 36 |
| 2020 | 19 | 29 |
| 2021 | 29 | 40 |
| 2022 | 22 | 89 |
| 2023 | 28 | 94 |
| 2024 | 50 | 75 |
| 2025 | 75 | 43 |
| 2026 | 34 | 42 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Steel sheet1 Sep 2026US 12,723,295 B2Nippon Steel Corporation
- High strength steel sheet having excellent workability and method for manufacturing same25 Aug 2026US 12,716,110 B2Posco
- Process for producing an at least partly quenched and tempered sheet steel component and at least partly quenched and tempered sheet steel component21 Jul 2026US 12,686,899 B2ThyssenKrupp Steel Europe AG
- Steel sheet for hot stamping, method for manufacturing the same, hot stamped component, and method for manufacturing the same16 Jun 2026US 12,655,495 B2Nippon Steel Corporation
- Method for producing a screw, and screw2 Jun 2026US 12,644,162 B2EJOT GmbH & Co. KG
- High-strength steel sheet and manufacturing method therefor27 Aug 2026US 2026/0250811 A1Jfe Steel Corporation
- High-strength steel sheet and method for manufacturing same27 Aug 2026US 2026/0250812 A1Jfe Steel Corporation
- Steel sheet, member, and part, and methods of producing same27 Aug 2026US 2026/0250814 A1Jfe Steel Corporation
- Martensitic stainless steel seamless pipe and method for producing the same27 Aug 2026US 2026/0250819 A1Jfe Steel Corporation
- Steel for knives20 Aug 2026US 2026/0242886 A1Proterial, Ltd.
Most cited
By later US patents
- Method of making high strength, tough alloy steel62US 4,170,499 AThe Regents of the University of California · 1979
- Super hard high-speed tool steel42US 4,880,461 AHitachi Metals, Ltd. · 1989
- Iron-based alloys and methods of making and use thereof42US 9,334,547 B2L. E. Jones Company · 2016
- High performance iron-based alloys for engine valvetrain applications and methods of making and use thereof37US 10,677,109 B2I. E. Jones Company · 2020
- Manufacture of a metallic molded structural part32US 5,972,134 ABenteler AG · 1999