B21D 53/08
Of both metal tubes and sheet metal
Official title: of both metal tubes and sheet metal (connecting tubes in openings B21D39/06)
B21D53/08 (Of both metal tubes and sheet metal) appears on 374 US grants and 289 published applications in this corpus.
Search patents in B21D- Granted patents
- 374
- Published applications
- 289
- Assignees
- 178
- Inventors
- 796
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 9 | 0 |
| 1987 | 7 | 0 |
| 1988 | 12 | 0 |
| 1989 | 12 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 12 | 0 |
| 1993 | 12 | 0 |
| 1994 | 2 | 0 |
| 1995 | 10 | 0 |
| 1996 | 6 | 0 |
| 1997 | 10 | 0 |
| 1998 | 9 | 0 |
| 1999 | 9 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 2 |
| 2002 | 5 | 11 |
| 2003 | 8 | 7 |
| 2004 | 4 | 10 |
| 2005 | 8 | 12 |
| 2006 | 5 | 12 |
| 2007 | 4 | 3 |
| 2008 | 1 | 12 |
| 2009 | 3 | 11 |
| 2010 | 6 | 15 |
| 2011 | 6 | 19 |
| 2012 | 7 | 9 |
| 2013 | 7 | 20 |
| 2014 | 6 | 18 |
| 2015 | 16 | 17 |
| 2016 | 16 | 16 |
| 2017 | 20 | 6 |
| 2018 | 7 | 12 |
| 2019 | 16 | 21 |
| 2020 | 11 | 14 |
| 2021 | 13 | 8 |
| 2022 | 16 | 11 |
| 2023 | 7 | 5 |
| 2024 | 5 | 7 |
| 2025 | 3 | 9 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fin assembling method24 Feb 2026US 12,560,391 B2Daikin Industries, Ltd.
- Heat exchanger and method for processing heat exchanger4 Nov 2025US 12,460,872 B2Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd.
- Ribbed tubeless heat exchanger for fluid heating systems including a rib component and methods of manufacture thereof7 Oct 2025US 12,435,929 B2Fulton Group N.A., Inc.
- Modular intercooler block18 Feb 2025US 12,228,349 B2K&N Engineering, Inc.
- Method for producing heat exchanger17 Dec 2024US 12,168,273 B2Danfoss A/S
- Fin assembling method7 May 2026US 2026/0126250 A1Daikin Industries, Ltd.
- Method for manufacturing heat exchanger5 Feb 2026US 2026/0034620 A1Daikin Industries, Ltd.
- Heat transfer pipe, heat exchanger, pipe expanding tool, pipe expanding device, method for connecting heat transfer pipe and pipe, and method for manufacturing heat exchanger28 Aug 2025US 2025/0271218 A1Mitsubishi Electric Corporation
- Method for manufacturing heat exchanger26 Jun 2025US 2025/0205836 A1Daikin Industries, Ltd.
- Modular Intercooler Block29 May 2025US 2025/0172349 A1K&N Engineering, Inc.
Most cited
By later US patents
- Heat exchanger141US 6,964,296 B2Modine Manufacturing Company · 2005
- Heat exchanger and method for manufacturing the heat exchanger45US 5,099,576 ASanden Corporation · 1992
- Deterioration resistant chambers for inductively coupled plasma production40US 6,946,063 B1Advanced Energy Industries, Inc. · 2005
- Heat exchanger and method of assembly thereof37US 5,150,520 AThe Allen Group Inc. · 1992
- Tube expander37US 5,806,173 AHidaka Seiki Kabushiki Kaisha · 1998