C21D 1/20
Isothermal quenching
Official title: Isothermal quenching, e.g. bainitic hardening
C21D1/20 (Isothermal quenching) appears on 243 US grants and 312 published applications in this corpus.
Search patents in C21D- Granted patents
- 243
- Published applications
- 312
- Assignees
- 168
- Inventors
- 798
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 10 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 8 | 1 |
| 2002 | 5 | 2 |
| 2003 | 3 | 5 |
| 2004 | 4 | 12 |
| 2005 | 4 | 5 |
| 2006 | 3 | 5 |
| 2007 | 2 | 5 |
| 2008 | 1 | 3 |
| 2009 | 4 | 10 |
| 2010 | 1 | 5 |
| 2011 | 6 | 10 |
| 2012 | 3 | 8 |
| 2013 | 7 | 16 |
| 2014 | 6 | 15 |
| 2015 | 12 | 29 |
| 2016 | 8 | 14 |
| 2017 | 12 | 15 |
| 2018 | 8 | 11 |
| 2019 | 13 | 15 |
| 2020 | 4 | 17 |
| 2021 | 7 | 18 |
| 2022 | 15 | 21 |
| 2023 | 13 | 18 |
| 2024 | 20 | 29 |
| 2025 | 16 | 13 |
| 2026 | 14 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Steel sheet having excellent formability and strain hardening rate26 May 2026US 12,637,731 B2Posco
- Carbon steel and austenitic stainless steel rolling clad plate manufacturing method therefor19 May 2026US 12,629,766 B2Baoshan Iron & Steel Co., Ltd.
- High-strength cold-rolled steel sheet, high-strength coated or plated steel sheet, method of producing high-strength cold-rolled steel sheet, method of producing high-strength coated or plated steel sheet, and automotive part12 May 2026US 12,624,408 B2Jfe Steel Corporation
- One-step carbo-nitro-austempering process for forming steel bearings10 Sep 2026US 2026/0265851 A1GM Global Technology Operations LLC
- Process for producing an at least partly quenched and tempered sheet steel component and at least partly quenched and tempered sheet steel component13 Aug 2026US 2026/0234743 A1ThyssenKrupp Steel Europe AG
- Steel sheet and member, and production methods therefor23 Jul 2026US 2026/0209913 A1Jfe Steel Corporation
- Ultra-high-strength cold-rolled steel sheet having excellent yield strength and bending properties and method for manufacturing same16 Jul 2026US 2026/0201522 A1Posco
- Salt-bath heat treatment apparatus18 Jun 2026US 2026/0168044 A1Parker Netsushori Kogyo K.K.
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
- Process of making an austempered ductile iron article29US 4,880,477 ATextron Inc. · 1989
- Camshaft29US 5,028,281 ATextron Inc. · 1991
- Die-less drawing method and apparatus28US 4,872,923 AU.S. Automation Company · 1989