C21D 1/64
With circulating liquids
Official title: with circulating liquids
C21D1/64 (With circulating liquids) appears on 47 US grants and 37 published applications in this corpus.
Search patents in C21D- Granted patents
- 47
- Published applications
- 37
- Assignees
- 43
- Inventors
- 134
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 4 |
| 2013 | 1 | 2 |
| 2014 | 2 | 5 |
| 2015 | 1 | 2 |
| 2016 | 2 | 3 |
| 2017 | 4 | 2 |
| 2018 | 2 | 1 |
| 2019 | 2 | 4 |
| 2020 | 1 | 2 |
| 2021 | 3 | 1 |
| 2022 | 1 | 2 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 2 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for cooling a steel strip11 Nov 2025US 12,465,966 B2ArcelorMittal
- Quenching method5 Aug 2025US 12,378,620 B2Aisin Corporation
- Lead-free patenting process and equipment12 Apr 2022US 11,299,795 B2NV Bekaert SA
- Oil-immersion quenching cooling precursor and oil-immersion quenching cooling method16 Nov 2021US 11,174,528 B2Beijing Huali Fine Chemical Co., Ltd.
- Wall member useful in quenching11 May 2021US 11,001,903 B2ROLLS-ROYCE plc
- Quenching apparatus30 Jul 2026US 2026/0218324 A1Aisin Corporation
- Quenching apparatus, continuous annealing facility, quenching method, method for manufacturing steel sheet, and method for manufacturing coated steel sheet24 Apr 2025US 2025/0129443 A1Jfe Steel Corporation
- Quenching apparatus, continuous annealing facility, quenching method, method for manufacturing steel sheet, and method for manufacturing coated steel sheet24 Apr 2025US 2025/0129445 A1Jfe Steel Corporation
- Methods and systems for vacuum and oil austempering in producing bainite21 Mar 2024US 2024/0093321 A1Cummins Inc.
- Fluid guide for quenching metal workpieces8 Feb 2024US 2024/0043946 A1ALD Vacuum Technologies GmbH
Most cited
By later US patents
- Steel pipe hardening apparatus37US 4,376,528 AKawasaki Steel Corporation · 1983
- Method of heat treating metal with liquid coolant containing dissolved gas14US 5,681,407 AAluminum Company of America · 1997
- Spray quenching of metal with liquid coolant containing dissolved gas13US 5,820,705 AAluminum Company of America · 1998
- Continuous hardening device of steel plate12US 4,415,143 AKawasaki Steel Corporation · 1983
- Method of and apparatus for controlled cooling of metallurgical products7US 4,395,022 ACentre de Recherches Metallurgiques-Centum voor Research in de Metallurgie · 1983