C21D 9/30
Heat treatment: for crankshafts
Official title: for crankshafts; for camshafts
C21D9/30 (Heat treatment: for crankshafts) appears on 154 US grants and 136 published applications in this corpus.
Search patents in C21D- Granted patents
- 154
- Published applications
- 136
- Assignees
- 97
- Inventors
- 371
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 7 | 0 |
| 2003 | 4 | 0 |
| 2004 | 0 | 8 |
| 2005 | 2 | 2 |
| 2006 | 3 | 2 |
| 2007 | 0 | 7 |
| 2008 | 0 | 5 |
| 2009 | 4 | 4 |
| 2010 | 4 | 7 |
| 2011 | 1 | 7 |
| 2012 | 5 | 8 |
| 2013 | 5 | 4 |
| 2014 | 4 | 9 |
| 2015 | 4 | 7 |
| 2016 | 7 | 3 |
| 2017 | 6 | 11 |
| 2018 | 6 | 7 |
| 2019 | 3 | 8 |
| 2020 | 8 | 10 |
| 2021 | 8 | 7 |
| 2022 | 6 | 7 |
| 2023 | 3 | 3 |
| 2024 | 4 | 4 |
| 2025 | 4 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Forged part of steel and a method of manufacturing thereof28 Apr 2026US 12,612,683 B2ArcelorMittal
- Method for repairing a component by heat treating14 Apr 2026US 12,601,023 B2Caterpillar Motoren GmbH & Co. KG
- Crankshaft and method of manufacturing forged material for crankshaft2 Sep 2025US 12,403,526 B2Nippon Steel Corporation
- Crankshaft8 Jul 2025US 12,352,309 B2Nippon Steel Corporation
- Steel shaft component15 Apr 2025US 12,276,005 B2Nippon Steel Corporation
- Magnetically enhanced induction heat treating application27 Aug 2026US 2026/0250796 A1Ajax Tocco Magnethermic Corporation
- Methods for producing locally hardened components2 Jul 2026US 2026/0185175 A1Southwest Technology and Engineering Research Institute
- Steel material18 Dec 2025US 2025/0382687 A1Nippon Steel Corporation
- Systems and methods for improving iron-based camshaft fatigue life27 Nov 2025US 2025/0360557 A1Cummins Inc.
- Crankshaft and method of manufacturing the same23 Oct 2025US 2025/0327479 A1Nippon Steel Corporation
Most cited
By later US patents
- Surface hardening of cams of motor-vehicle camshafts1,402US 4,312,685 AAudi NSU Auto Union Aktiengesellschaft · 1982
- Method and apparatus for hardening axially spaced cams on a camshaft61US 4,728,761 ATocco, Inc. · 1988
- Method and apparatus for hardening cam lobes on a camshaft46US 4,893,789 ATocco, Inc. · 1990
- Methods of forming steel46US 6,258,185 B1Bechtel BWXT Idaho, LLC · 2001
- 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