B21D 28/28
In tubes or other hollow bodies
Official title: in tubes or other hollow bodies
B21D28/28 (In tubes or other hollow bodies) appears on 175 US grants and 115 published applications in this corpus.
Search patents in B21D- Granted patents
- 175
- Published applications
- 115
- Assignees
- 125
- Inventors
- 331
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 6 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 7 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 1 |
| 2002 | 8 | 6 |
| 2003 | 7 | 4 |
| 2004 | 7 | 1 |
| 2005 | 2 | 8 |
| 2006 | 6 | 6 |
| 2007 | 4 | 6 |
| 2008 | 3 | 6 |
| 2009 | 6 | 4 |
| 2010 | 4 | 5 |
| 2011 | 1 | 0 |
| 2012 | 2 | 3 |
| 2013 | 2 | 3 |
| 2014 | 1 | 4 |
| 2015 | 4 | 3 |
| 2016 | 2 | 3 |
| 2017 | 1 | 4 |
| 2018 | 4 | 7 |
| 2019 | 4 | 8 |
| 2020 | 4 | 4 |
| 2021 | 5 | 3 |
| 2022 | 2 | 8 |
| 2023 | 3 | 7 |
| 2024 | 13 | 5 |
| 2025 | 5 | 5 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and device for perforating a pipe wall25 Aug 2026US 12,715,029 B2T-Drill Oy
- System, apparatus, and method for louver perforation4 Nov 2025US 12,460,516 B1Roscoe Moss Manufacturing Company
- Method for manufacturing vehicle suspension arm and vehicle suspension arm28 Oct 2025US 12,454,161 B2Yorozu Corporation
- Trimming device1 Jul 2025US 12,343,779 B2Fuji Springs Co., Inc.
- Automated punching station for the production of punched components, punched component and relative production method10 Jun 2025US 12,324,571 B2Hpf S.R.L.
- Battery can trimming apparatus and method5 Mar 2026US 2026/0061476 A1Samsung SDI.Co., Ltd.
- Method of manufacturing banjo bolt23 Oct 2025US 2025/0326026 A1Matsumoto Heavy Industry Co. Ltd.
- Method and device for making a t-branch for pipes25 Sep 2025US 2025/0297701 A1T-Drill Oy
- Perforation system and method for forming perforations in side-walls of ground-installed-pipe14 Aug 2025US 2025/0256422 A1
- Device and system for laying and inserting variable holes in irrigation tubing5 Jun 2025US 2025/0178061 A1Mississippi State University
Most cited
By later US patents
- Apparatus and method for forming a tubular member53US 5,481,892 A1996
- Apparatus for piercing hydroformed part42US 5,398,533 AGeneral Motors Corporation · 1995
- Method of and apparatus for the cutting of an opening in a hollow body42US 5,460,026 AWilhelm Schafer Maschinenbau GmbH & Co. · 1995
- Apparatus and method for cold forming an L-shaped lead alloy battery terminal37US 5,606,887 ATulip Corporation · 1997
- Apparatus and method for forming a tubular frame member35US 5,239,852 AArmco Steel Corporation · 1993