B23K 20/028
Butt welding
Official title: {Butt welding}
B23K20/028 (Butt welding) appears on 67 US grants and 42 published applications in this corpus.
Search patents in B23K- Granted patents
- 67
- Published applications
- 42
- Assignees
- 55
- Inventors
- 180
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 2 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 1 | 3 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 4 |
| 2012 | 1 | 1 |
| 2013 | 1 | 2 |
| 2014 | 1 | 2 |
| 2015 | 4 | 4 |
| 2016 | 2 | 2 |
| 2017 | 4 | 3 |
| 2018 | 2 | 0 |
| 2019 | 2 | 3 |
| 2020 | 1 | 2 |
| 2021 | 0 | 1 |
| 2022 | 2 | 3 |
| 2023 | 4 | 2 |
| 2024 | 7 | 5 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cold pressure welding apparatus, coil manufacturing apparatus, coil, and method of manufacturing the same31 Mar 2026US 12,592,621 B2Aster Co., Ltd.
- Face guard for use in ball game and method for making the same6 Jan 2026US 12,514,322 B2Yu Hsun Enterprise Co., Ltd.
- Method and system for joining metal workpieces to provide a workpiece assembly28 Oct 2025US 12,454,025 B2
- Method for manufacturing shaft15 Oct 2024US 12,115,593 B2Sanjo Machine Works, Ltd.
- Method for manufacturing shaft1 Oct 2024US 12,103,100 B2Sanjo Machine Works, Ltd.
- Method of jointing cables16 Oct 2025US 2025/0323477 A1
- Cold pressure welding apparatus, coil manufacturing apparatus, coil, and method of manufacturing the same5 Dec 2024US 2024/0405646 A1Aster Co., Ltd.
- Method and system for joining metal workpieces to provide a workpiece assembly11 Jul 2024US 2024/0227064 A9
- Method for manufacturing shaft16 May 2024US 2024/0157465 A1Sanjo Machine Works, Ltd.
- Method and system for joining metal workpieces to provide a workpiece assembly25 Apr 2024US 2024/0131616 A1
Most cited
By later US patents
- Method and apparatus for superplastic forming and diffusion bonding of hollow parts32US 4,988,037 ARohr Industries, Inc. · 1991
- Method for bonding dual-phase stainless steel26US 6,024,276 ASumitomo Metal Industries, Ltd. · 2000
- Diffusion bonding apparatus for pipes23US 6,098,866 ADaido Tokushuko Kabushiki Kaisha · 2000
- Method and apparatus for joining hot strips19US 5,234,154 AHitachi, Ltd. · 1993
- Method of and apparatus for joining hot materials to be rolled to each other as well as continuous hot rolling method and system18US 5,121,873 AHitachi, Ltd. · 1992