B21L 21/00
Tools or implements for repairing chains using metal-working operations
Official title: Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links
B21L21/00 (Tools or implements for repairing chains using metal-working operations) appears on 71 US grants and 37 published applications in this corpus.
Search patents in B21L- Granted patents
- 71
- Published applications
- 37
- Assignees
- 32
- Inventors
- 100
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 3 |
| 2004 | 1 | 0 |
| 2005 | 2 | 2 |
| 2006 | 3 | 0 |
| 2007 | 2 | 2 |
| 2008 | 3 | 0 |
| 2009 | 2 | 2 |
| 2010 | 1 | 1 |
| 2011 | 0 | 2 |
| 2012 | 3 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 1 |
| 2021 | 0 | 7 |
| 2022 | 3 | 4 |
| 2023 | 4 | 3 |
| 2024 | 2 | 3 |
| 2025 | 2 | 3 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Bicycle tool mounted in bicycle tube29 Sep 2026US 12,746,647 B2U-Power Collection Enterprise Co., Ltd.
- Tool for driving a chain pin out of a chain link1 Sep 2026US 12,722,261 B2Daysaver AG
- Track disassembling device19 May 2026US 12,630,239 B2Huaneng Yimin Coal-Power Co., Ltd.
- Forklift hydraulic motor based industrial driver apparatus27 May 2025US 12,313,096 B2One Pass Innovators, LLC
- Wedge driver and method therefor29 Apr 2025US 12,285,796 B2BNSF Railway Company
- Wedge driver and method therefor14 Aug 2025US 2025/0256325 A1BNSF Railway Company
- Handheld Tool for Detaching and Attaching Agricultural Chain Link3 Apr 2025US 2025/0108432 A1
- Tool for driving a chain pin out of a chain link6 Feb 2025US 2025/0042009 A1Daysaver AG
- Track disassembling device19 Dec 2024US 2024/0417932 A1Huaneng Yimin Coal-Power Co., Ltd.
- Wedge driver and method therefor18 Apr 2024US 2024/0123491 A1BNSF Railway Company
Most cited
By later US patents
- Conveyor chain pin remover368US 7,430,849 B1Practical Inventions, LLC · 2008
- Portable track link disassembly tool24US 7,100,353 B1Caterpillar Inc. · 2006
- Roller chain plier21US 4,157,594 A1979
- Method and apparatus for installing links on an endless track chain20US 6,951,096 B2Caterpillar Inc. · 2005
- Tool and method for removing a clip member from a master link in a chain member19US 5,193,336 A1993