H02K 21/024
Radial air gap machines
Official title: {Radial air gap machines}
H02K21/024 (Radial air gap machines) appears on 78 US grants and 69 published applications in this corpus.
Search patents in H02K- Granted patents
- 78
- Published applications
- 69
- Assignees
- 46
- Inventors
- 146
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 4 |
| 2003 | 3 | 1 |
| 2004 | 2 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 2 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 4 | 2 |
| 2011 | 2 | 0 |
| 2012 | 1 | 0 |
| 2013 | 1 | 4 |
| 2014 | 0 | 3 |
| 2015 | 2 | 1 |
| 2016 | 4 | 2 |
| 2017 | 4 | 1 |
| 2018 | 5 | 11 |
| 2019 | 4 | 4 |
| 2020 | 9 | 2 |
| 2021 | 3 | 6 |
| 2022 | 6 | 4 |
| 2023 | 2 | 5 |
| 2024 | 4 | 8 |
| 2025 | 5 | 0 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Rotor and electric machine6 Aug 2026US 2026/0229974 A1Schaeffler Technologies AG & Co. KG
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Most cited
By later US patents
- Brushless permanent magnet motor/generator with axial rotor decoupling to eliminate magnet induced torque losses80US 7,863,789 B2Dura-Trac Motors, Inc. · 2011
- Flywheel based energy storage system79US 5,614,777 AU.S. Flywheel Systems · 1997
- Brushless permanent magnet motor or alternator with variable axial rotor/stator alignment to increase speed capability52US 6,555,941 B1Dura-Trac Motors, Inc. · 2003
- Power transmission apparatus for vehicle and power transmission system for vehicle47US 10,724,616 B2Exedy Corporation · 2020
- Brushless permanent magnet motor with variable axial rotor/stator alignment to increase speed capability46US 6,492,753 B2Dura-Trac Motors, Inc. · 2002