H02K 21/18
Having horse-shoe armature cores
Official title: having horse-shoe armature cores (with homopolar co-operation H02K21/20)
H02K21/18 (Having horse-shoe armature cores) appears on 116 US grants and 95 published applications in this corpus.
Search patents in H02K- Granted patents
- 116
- Published applications
- 95
- Assignees
- 72
- Inventors
- 200
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 7 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 3 |
| 2003 | 3 | 3 |
| 2004 | 3 | 5 |
| 2005 | 5 | 3 |
| 2006 | 1 | 5 |
| 2007 | 1 | 2 |
| 2008 | 2 | 3 |
| 2009 | 0 | 2 |
| 2010 | 4 | 7 |
| 2011 | 4 | 4 |
| 2012 | 0 | 0 |
| 2013 | 5 | 3 |
| 2014 | 2 | 5 |
| 2015 | 0 | 3 |
| 2016 | 1 | 4 |
| 2017 | 5 | 21 |
| 2018 | 5 | 2 |
| 2019 | 11 | 4 |
| 2020 | 4 | 5 |
| 2021 | 4 | 2 |
| 2022 | 1 | 1 |
| 2023 | 1 | 3 |
| 2024 | 3 | 2 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Actuator for a vehicle assembly5 Aug 2025US 12,381,462 B2Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Coburg
- Systems and methods for magnetic haptic feedback15 Jul 2025US 12,360,598 B2Bang & Olufsen A/S
- Rotary reciprocating driving actuator7 Jan 2025US 12,191,737 B2Mitsumi Electric Co., Ltd.
- Rotary reciprocating drive actuator17 Sep 2024US 12,095,332 B2Mitsumi Electric Co., Ltd.
- Rotary reciprocating drive actuator19 Mar 2024US 11,936,250 B2Mitsumi Electric Co., Ltd.
- Electric generator device20 Nov 2025US 2025/0357835 A1Preciflex SA
- Modular Electromechanical Assembly8 May 2025US 2025/0149959 A1
- Rotary reciprocating drive actuator9 May 2024US 2024/0154509 A1Mitsumi Electric Co., Ltd.
- Systems and methods for magnetic haptic feedback4 Apr 2024US 2024/0111364 A1Bang & Olufsen A/S
- Actuator for a vehicle assembly21 Sep 2023US 2023/0299653 A1Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Coburg
Most cited
By later US patents
- Synchronous electric motor, particularly for submersible pumps, and pump including the motor70US 5,767,606 AHydor Srl · 1998
- Electric generator and lighting assembly62US 5,982,059 A1999
- Permanent magnet rotor and method and apparatus for making same58US 5,345,129 AGeneral Electric Company · 1994
- Rotary electric motor having magnetically isolated stator and rotor groups57US 6,492,756 B1Wavecrest Laboratories, LLC · 2002
- Miniature electric generator and lighting apparatus54US 5,793,130 A1998