C21D 1/55
Hardenability tests
Official title: Hardenability tests, e.g. end-quench tests
C21D1/55 (Hardenability tests) appears on 18 US grants and 16 published applications in this corpus.
Search patents in C21D- Granted patents
- 18
- Published applications
- 16
- Assignees
- 21
- Inventors
- 56
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 2 |
| 2016 | 4 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for repairing a component by heat treating14 Apr 2026US 12,601,023 B2Caterpillar Motoren GmbH & Co. KG
- Low phosphorus, zirconium micro-alloyed, fracture resistant steel alloys18 Nov 2025US 12,473,619 B2A. Finkl & Sons Co.
- Method for manufacturing cold-forged, extruded aluminum alloy tube16 Jan 2024US 11,872,616 B2Jin Yuncheng Enterprise Co., Ltd.
- Air vent10 Sep 2019US 10,408,490 B2Faurecia Innenraum Systeme GmbH
- Method for repairing break of universal connecting rod of universal coupling1 May 2018US 9,957,583 B2Wuhan Kaiming High Tech Co., Ltd.
- A method and associated system to characterize an alloy's hardenability for finite element analysis3 Oct 2024US 2024/0327940 A1Integrated Heat Treating Solutions, LLC
- Method for repairing a component by heat treating9 Nov 2023US 2023/0357873 A1Caterpillar Motoren GmbH & Co. KG
- Railway wheel20 Apr 2023US 2023/0119875 A1Nippon Steel Corporation
- Method for manufacturing cold-forged extruded aluminum alloy rod30 Jun 2022US 2022/0203418 A1
- Method for manufacturing cold-forged, extruded aluminum alloy tube25 Feb 2021US 2021/0053099 A1Jin Yuncheng Enterprise Co., Ltd.
Most cited
By later US patents
- Air vent9US 9,513,027 B2Faurecia Innenraum Systeme GmbH · 2016
- Inspecting apparatus with eddy current inspection5US 7,491,319 B1Te Hung En Enterprise Co., Ltd. · 2009
- Quench-hardening testing method and apparatus4US 5,666,287 ANsk Ltd. · 1997
- Air vent3US 10,408,490 B2Faurecia Innenraum Systeme GmbH · 2019
- Method for the controlled cooling of hot rolled steel samples3US 4,950,338 ABethlehem Steel Corporation · 1990