B21D 28/16
Shoulder or burr prevention
Official title: Shoulder or burr prevention {, e.g. fine-blanking}
B21D28/16 (Shoulder or burr prevention) appears on 124 US grants and 139 published applications in this corpus.
Search patents in B21D- Granted patents
- 124
- Published applications
- 139
- Assignees
- 94
- Inventors
- 324
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 2 |
| 2007 | 1 | 3 |
| 2008 | 0 | 7 |
| 2009 | 1 | 9 |
| 2010 | 5 | 1 |
| 2011 | 0 | 6 |
| 2012 | 5 | 5 |
| 2013 | 2 | 7 |
| 2014 | 8 | 4 |
| 2015 | 3 | 11 |
| 2016 | 3 | 8 |
| 2017 | 8 | 8 |
| 2018 | 7 | 10 |
| 2019 | 8 | 8 |
| 2020 | 8 | 10 |
| 2021 | 6 | 4 |
| 2022 | 10 | 5 |
| 2023 | 5 | 6 |
| 2024 | 3 | 5 |
| 2025 | 5 | 9 |
| 2026 | 3 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Press-formed product, rolling bearing, vehicle, machine, press-formed product manufacturing method, rolling bearing manufacturing method, vehicle manufacturing method, and machine manufacturing method15 Sep 2026US 12,734,574 B2Nsk Ltd.
- Burring processing method, burring processing mold, burring processing device, and burring processed product12 May 2026US 12,623,270 B2Nippon Steel Corporation
- Die assembly and method for producing blank using the die assembly27 Jan 2026US 12,533,723 B2Nippon Steel Corporation
- Tool unit, press for holding such a tool unit and method for a ready-to-operate arrangement of the tool unit in the holder of the press9 Sep 2025US 12,409,675 B2Andritz Schuler Pressen GmbH
- 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
- Press forming apparatus and production method of press formed product17 Sep 2026US 2026/0273607 A1Nippon Steel Corporation
- Laminated core manufacturing apparatus and laminated core manufacturing method25 Jun 2026US 2026/0180376 A1Posco Mobility Solution Corporation
- Structure around through-hole in metal sheet, blank, and automotive part18 Jun 2026US 2026/0166615 A1Nippon Steel Corporation
- Punching processing control method18 Jun 2026US 2026/0166834 A1Panasonic Intellectual Property Management Co., Ltd.
- Method and apparatus for producing a calibrated stamped part21 May 2026US 2026/0138391 A1
Most cited
By later US patents
- Hydraulic driven press31US 4,116,122 AOsterwalder AG · 1978
- Method of blanking26US 4,362,078 AAkzona Incorporated · 1982
- Method for producing burr-free blanks and the blanks produced thereby26US 4,477,537 ABlase Tool and Manufacturing Co., Inc. · 1984
- Method of shearing thin metal sheet23US 5,458,717 ANippondenso Co., Ltd. · 1995
- Stamping die for producing smooth-edged metal parts having complex perimeter shapes22US 6,370,931 B12002