C21D 1/19
By interrupted quenching
Official title: by interrupted quenching
C21D1/19 (By interrupted quenching) appears on 580 US grants and 839 published applications in this corpus.
Search patents in C21D- Granted patents
- 580
- Published applications
- 839
- Assignees
- 268
- Inventors
- 1,661
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 11 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 14 | 4 |
| 2002 | 8 | 2 |
| 2003 | 6 | 11 |
| 2004 | 9 | 19 |
| 2005 | 5 | 7 |
| 2006 | 6 | 10 |
| 2007 | 2 | 8 |
| 2008 | 4 | 13 |
| 2009 | 8 | 15 |
| 2010 | 6 | 10 |
| 2011 | 9 | 15 |
| 2012 | 6 | 12 |
| 2013 | 7 | 24 |
| 2014 | 10 | 28 |
| 2015 | 17 | 42 |
| 2016 | 14 | 23 |
| 2017 | 25 | 41 |
| 2018 | 16 | 27 |
| 2019 | 31 | 46 |
| 2020 | 13 | 42 |
| 2021 | 26 | 56 |
| 2022 | 45 | 97 |
| 2023 | 32 | 94 |
| 2024 | 57 | 90 |
| 2025 | 81 | 51 |
| 2026 | 42 | 52 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Carbide refining method of high-carbon high-alloy steel29 Sep 2026US 12,747,488 B2Shanghai Jiaotong University
- 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
- High-strength steel sheet having excellent bendability and formability and method for manufacturing same11 Aug 2026US 12,703,890 B2Posco
- High strength steel for structure with excellent corrosion resistance and manufacturing method for same16 Jun 2026US 12,655,491 B2Posco
- One-step carbo-nitro-austempering process for forming steel bearings10 Sep 2026US 2026/0265851 A1GM Global Technology Operations LLC
- Induction hardening treatment method and application for large bearing ring3 Sep 2026US 2026/0258521 A1
- Steel for knives20 Aug 2026US 2026/0242886 A1Proterial, Ltd.
- Steel sheet, member, and methods for producing the same20 Aug 2026US 2026/0242907 A1Jfe Steel Corporation
- A high strength steel strip or sheet, and a method for producing the same20 Aug 2026US 2026/0242908 A1voestalpine Stahl GmbH
Most cited
By later US patents
- Machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same44US 7,070,666 B2Intermet Corporation · 2006
- High-strength hot-rolled steel sheet having excellent stretch flangeability, and method of producing the same40US 6,364,968 B1Kawasaki Steel Corporation · 2002
- Ultra-high strength, weldable steels with excellent ultra-low temperature toughness34US 6,264,760 B1ExxonMobil Upstream Research Company · 2001
- Method for producing titanium-bearing microalloyed high-strength low-alloy steel34US 6,669,789 B1Nucor Corporation · 2003
- Process of making an austempered ductile iron article29US 4,880,477 ATextron Inc. · 1989