B21L
Making metal chains
Official title: MAKING METAL CHAINS (making chains or chain links by casting B22D25/02; chains in general F16G)
B21L (Making metal chains) appears on 419 US grants and 232 published applications in this corpus.
Search patents in B21L- Granted patents
- 419
- Published applications
- 232
- Assignees
- 203
- Inventors
- 609
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 12 | 0 |
| 1978 | 13 | 0 |
| 1979 | 11 | 0 |
| 1980 | 8 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 6 | 0 |
| 1987 | 10 | 0 |
| 1988 | 8 | 0 |
| 1989 | 5 | 0 |
| 1990 | 9 | 0 |
| 1991 | 6 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 9 | 0 |
| 1995 | 11 | 0 |
| 1996 | 10 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 5 | 0 |
| 2000 | 9 | 0 |
| 2001 | 10 | 6 |
| 2002 | 14 | 16 |
| 2003 | 17 | 23 |
| 2004 | 11 | 15 |
| 2005 | 14 | 8 |
| 2006 | 13 | 7 |
| 2007 | 3 | 17 |
| 2008 | 8 | 15 |
| 2009 | 9 | 14 |
| 2010 | 8 | 5 |
| 2011 | 7 | 7 |
| 2012 | 9 | 7 |
| 2013 | 4 | 9 |
| 2014 | 12 | 6 |
| 2015 | 7 | 3 |
| 2016 | 7 | 7 |
| 2017 | 3 | 4 |
| 2018 | 5 | 8 |
| 2019 | 3 | 7 |
| 2020 | 5 | 7 |
| 2021 | 6 | 12 |
| 2022 | 5 | 8 |
| 2023 | 6 | 6 |
| 2024 | 5 | 8 |
| 2025 | 6 | 5 |
| 2026 | 6 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- B21L 11/00Making chains or chain links of special shape150
- B21L 9/00Making chains or chain links, the links being composed of two or139
- B21L 21/00Tools or implements for repairing chains using metal-working operations71
- B21L 15/00Finishing or dressing chains or chain links55
- B21L 3/00Making chains or chain links by bending the chain links or link33
- B21L 99/00Subject matter not provided for in other groups of this subclass32
- B21L 1/00Making chains or chain links by bending workpieces of rod, wire, or22
- B21L 7/00Making chains or chain links by cutting single loops or loop-parts from20
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
- Method for manufacturing a magnet and systems and devices including a magnet16 Jun 2026US 12,653,989 B2Stereotaxis, Inc.
- Track disassembling device19 May 2026US 12,630,239 B2Huaneng Yimin Coal-Power Co., Ltd.
- Laser weldable sterling alloy17 Feb 2026US 12,551,942 B2James Avery Craftsman, Inc.
- Laser weldable sterling alloy1 Oct 2026US 2026/0295657 A1James Avery Craftsman, Inc.
- Chain link and method for producing a chain link1 Jan 2026US 2026/0002578 A1Thiele GmbH & Co.KG
- 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
Most cited
By later US patents
- Conveyor chain pin remover368US 7,430,849 B1Practical Inventions, LLC · 2008
- Method and apparatus for controlling fluid flow170US 5,161,773 ANumed, Inc. · 1992
- Wrist watch band and manufacturing method therefor75US 4,266,400 AKabushiki Kaisha Bambi · 1981
- Interlaced compositions and methods of production54US 7,332,641 B2ClozeX Medical, LLC · 2008
- Linked ring structures49US 7,086,218 B1M & J - R & R Grosbard, Inc. · 2006