C21D 9/0087
Heat treatment: for chains, for chain links
Official title: {for chains, for chain links}
C21D9/0087 (Heat treatment: for chains, for chain links) appears on 40 US grants and 42 published applications in this corpus.
Search patents in C21D- Granted patents
- 40
- Published applications
- 42
- Assignees
- 34
- Inventors
- 139
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 4 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 3 | 4 |
| 2015 | 0 | 3 |
| 2016 | 2 | 4 |
| 2017 | 1 | 3 |
| 2018 | 1 | 3 |
| 2019 | 6 | 1 |
| 2020 | 0 | 3 |
| 2021 | 3 | 3 |
| 2022 | 0 | 3 |
| 2023 | 2 | 2 |
| 2024 | 1 | 2 |
| 2025 | 1 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Chain7 Apr 2026US 12,595,838 B2Tsubakimoto Chain Co.
- Scallop-resistant track link and method of making same15 Apr 2025US 12,275,468 B2Caterpillar Inc.
- Tracked undercarriage component, and method for producing the same24 Sep 2024US 12,098,450 B2Komatsu Ltd.
- Offset link for roller chain with enhanced strength1 Aug 2023US 11,713,492 B2Iwis Drive Systems, LLC
- High carbon steel track bushing4 Apr 2023US 11,618,516 B2Caterpillar Inc.
- Scallop-resistant track link and method of making same3 Jul 2025US 2025/0214660 A1Caterpillar Inc.
- Scallop-resistant track link and method of making same19 Jun 2025US 2025/0196951 A1Caterpillar Inc.
- Track link production method19 Dec 2024US 2024/0417819 A1Berco S.p.A.
- Component with integrated aluminum diffusion layer and aluminum oxide layer15 Aug 2024US 2024/0271285 A1KAMAX Holding GmbH & Co. KG
- Chain14 Sep 2023US 2023/0287963 A1Tsubakimoto Chain Co.
Most cited
By later US patents
- Silent chain30US 6,068,568 ATsubakimoto Chain Co. · 2000
- Surface-hardened chain link25US 5,997,662 AMetal Technic Research Laboratory · 1999
- Track link production method and track link produced by the same24US 7,040,080 B2Komatsu Ltd. · 2006
- Thermal process for selectively hardening track chain links21US 5,759,309 ACaterpillar Inc. · 1998
- Automatic apparatus for induction hardening16US 4,673,785 AComau S.p.A. · 1987