B21D 28/34
Perforating tools
Official title: Perforating tools; Die holders
B21D28/34 (Perforating tools) appears on 415 US grants and 381 published applications in this corpus.
Search patents in B21D- Granted patents
- 415
- Published applications
- 381
- Assignees
- 205
- Inventors
- 649
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 3 | 0 |
| 1978 | 7 | 0 |
| 1979 | 6 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 7 | 0 |
| 1991 | 9 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 9 | 0 |
| 2000 | 5 | 0 |
| 2001 | 10 | 6 |
| 2002 | 2 | 12 |
| 2003 | 6 | 6 |
| 2004 | 12 | 11 |
| 2005 | 4 | 10 |
| 2006 | 4 | 14 |
| 2007 | 11 | 9 |
| 2008 | 2 | 11 |
| 2009 | 7 | 16 |
| 2010 | 10 | 16 |
| 2011 | 7 | 14 |
| 2012 | 8 | 15 |
| 2013 | 12 | 16 |
| 2014 | 8 | 15 |
| 2015 | 9 | 12 |
| 2016 | 14 | 14 |
| 2017 | 19 | 17 |
| 2018 | 11 | 15 |
| 2019 | 12 | 25 |
| 2020 | 22 | 24 |
| 2021 | 15 | 22 |
| 2022 | 15 | 18 |
| 2023 | 17 | 16 |
| 2024 | 22 | 14 |
| 2025 | 7 | 20 |
| 2026 | 4 | 13 |
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
- Machining tool for box-end wrench and method of machining box-end wrench by using the same28 Jul 2026US 12,691,508 B2
- Punching tool for mobile use10 Feb 2026US 12,544,820 B2Alfra GmbH
- Die assembly and method for producing blank using the die assembly27 Jan 2026US 12,533,723 B2Nippon Steel Corporation
- Method for producing blank, method for producing press-formed part, method for judging shape, program for judging shape, apparatus for producing blank, and blank22 Jul 2025US 12,365,020 B2Nippon Steel Corporation
- Electrode shearing apparatus8 Oct 2026US 2026/0307132 A1Samsung SDI.Co., Ltd.
- Punch press die-closing adjustment mechanism10 Sep 2026US 2026/0264131 A1National Kaohsiung University of Science and Technology
- Method of manufacturing low-cost and high-strength thermoelectric module with simplified manufacturing process27 Aug 2026US 2026/0255876 A1Rmaterials Corporation
- Precision feed and guide system for sub-100 micron thickness metal foil sheets13 Aug 2026US 2026/0233285 A1ACS Industries, Inc.
- Sintering assemblies and associated components and methods13 Aug 2026US 2026/0233286 A1Battelle Energy Alliance, LLC
Most cited
By later US patents
- Quick change adjustable punch tool assembly and method of adjustment54US 6,047,621 AElba Electronetics, Inc. · 2000
- Punch assembly with feed gap maximization51US 6,895,797 B2Mate Precision Tooling, Inc. · 2005
- Adjustable form tool head50US 5,020,407 A1991
- Punch unit50US 5,839,341 AMate Precision Tooling, Inc. · 1998
- Punch assembly47US 5,131,303 AWilson Tool International Inc. · 1992