B21D 28/22
Notching the peripheries of circular blanks
Official title: Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
B21D28/22 (Notching the peripheries of circular blanks) appears on 134 US grants and 114 published applications in this corpus.
Search patents in B21D- Granted patents
- 134
- Published applications
- 114
- Assignees
- 81
- Inventors
- 264
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 6 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 1 |
| 2002 | 0 | 4 |
| 2003 | 5 | 2 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 4 | 1 |
| 2007 | 1 | 3 |
| 2008 | 1 | 4 |
| 2009 | 0 | 3 |
| 2010 | 1 | 2 |
| 2011 | 1 | 3 |
| 2012 | 5 | 4 |
| 2013 | 3 | 2 |
| 2014 | 5 | 3 |
| 2015 | 4 | 7 |
| 2016 | 3 | 2 |
| 2017 | 5 | 6 |
| 2018 | 3 | 2 |
| 2019 | 2 | 6 |
| 2020 | 2 | 6 |
| 2021 | 7 | 7 |
| 2022 | 7 | 11 |
| 2023 | 8 | 6 |
| 2024 | 5 | 15 |
| 2025 | 3 | 7 |
| 2026 | 0 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Bonded and stacked core manufacturing method and bonded and stacked core manufacturing apparatus25 Nov 2025US 12,479,199 B2Nippon Steel Corporation
- Laser assisted machining of sheet material27 May 2025US 12,311,462 B2Ipg Photonics Corporation
- Low-pressure aluminum casting mold and low-pressure aluminum casting process for motor rotor18 Feb 2025US 12,226,818 B2Shanxi Electric Motor Manufacturing Co., Ltd.
- Manufacturing apparatus for laminated iron core9 Jul 2024US 12,033,792 B2Kuroda Precision Industries Ltd.
- Method of manufacturing laminated core11 Jun 2024US 12,005,487 B2Nippon Steel Corporation
- Non oriented electrical steel sheet, iron core, manufacturing method of iron core, motor, and manufacturing method of motor16 Apr 2026US 2026/0103787 A1Nippon Steel Corporation
- Electrode notching mold for secondary battery having auto-balance unit, and auto-balance unit26 Feb 2026US 2026/0054408 A1GSPCOMPANY Co., Ltd.
- Secondary battery electrode plate manufacturing apparatus including die parallelism monitoring device and secondary battery electrode plate manufacturing method8 Jan 2026US 2026/0011708 A1Samsung SDI.Co., Ltd.
- Laminated core, more particularly for a stator of an electric machine, and method for producing said laminated core1 Jan 2026US 2026/0005554 A1voestalpine Stahl GmbH
- Axial-flux stator core1 Jan 2026US 2026/0005556 A1Koenigsegg Automotive AB
Most cited
By later US patents
- Method for manufacturing long, slender lamina stack from nonuniform laminae118US 6,163,949 AL. H. Carbide Corporation · 2000
- Apparatus for manufacture of laminated parts52US 4,619,028 AL. H. Carbide Corporation · 1986
- Apparatus for fabricating electrical equipment48US 4,320,645 ACard-O-Matic Pty. Limited · 1982
- Method for manufacture of laminated parts46US 4,738,020 AL. H. Carbide Corporation · 1988
- Method and apparatus for producing planar elements in the construction of surfaces and bodies37US 4,285,754 ASolid Photography Inc. · 1981