H02K 3/47
Air-gap windings, i.e. iron-free windings
H02K3/47 (Air-gap windings, i.e. iron-free windings) appears on 612 US grants and 682 published applications in this corpus.
Search patents in H02K- Granted patents
- 612
- Published applications
- 682
- Assignees
- 361
- Inventors
- 1,172
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 6 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 9 | 0 |
| 1998 | 7 | 0 |
| 1999 | 6 | 0 |
| 2000 | 17 | 0 |
| 2001 | 7 | 5 |
| 2002 | 8 | 15 |
| 2003 | 12 | 16 |
| 2004 | 19 | 11 |
| 2005 | 14 | 12 |
| 2006 | 19 | 19 |
| 2007 | 6 | 16 |
| 2008 | 8 | 19 |
| 2009 | 17 | 27 |
| 2010 | 13 | 36 |
| 2011 | 17 | 27 |
| 2012 | 24 | 33 |
| 2013 | 21 | 17 |
| 2014 | 16 | 28 |
| 2015 | 11 | 15 |
| 2016 | 9 | 14 |
| 2017 | 22 | 21 |
| 2018 | 16 | 30 |
| 2019 | 18 | 50 |
| 2020 | 27 | 41 |
| 2021 | 33 | 41 |
| 2022 | 35 | 66 |
| 2023 | 28 | 42 |
| 2024 | 47 | 34 |
| 2025 | 36 | 27 |
| 2026 | 19 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High speed axial air gap motor8 Sep 2026US 12,732,052 B2Novanta Corporation
- Three-phase coil structure and linear motor8 Sep 2026US 12,732,053 B2Proterial, Ltd.
- Armature and motor11 Aug 2026US 12,706,502 B2Denso Corporation
- Coil substrate, motor coil substrate, and motor4 Aug 2026US 12,700,765 B2Ibiden Co., Ltd.
- Slotless stators and methods for manufacturing such stators28 Jul 2026US 12,695,349 B2Maxon International AG
- Rotating Laser having a Drive Unit24 Sep 2026US 2026/0287352 A1Robert Bosch GmbH
- Rotating electric machine17 Sep 2026US 2026/0280394 A1Thk Co., Ltd.
- Slotless stators and methods for manufacturing such stators3 Sep 2026US 2026/0261175 A1Maxon International AG
- Axial flux motor stator structure20 Aug 2026US 2026/0246317 A1Delta Electronics, Inc.
- Coreless motor30 Jul 2026US 2026/0221832 A1Citizen Micro Co., Ltd.
Most cited
By later US patents
- Intravascular blood pump329US 7,011,620 B1Impella CardioSystems AG · 2006
- Miniature motor207US 6,794,789 B2Impella CardioSystems AG · 2004
- Wind turbine119US 7,042,109 B22006
- Axial field motor/generator110US 5,982,074 AAdvanced Technologies Int., Ltd. · 1999
- Low damping torque brushless D.C. motor103US 4,733,118 AHHK Inc. · 1988