H02K 9/28
Cooling of commutators, slip-rings or brushes e.g. by ventilating
H02K9/28 (Cooling of commutators, slip-rings or brushes e.g. by ventilating) appears on 190 US grants and 163 published applications in this corpus.
Search patents in H02K- Granted patents
- 190
- Published applications
- 163
- Assignees
- 104
- Inventors
- 425
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 6 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 8 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 5 | 8 |
| 2003 | 5 | 3 |
| 2004 | 4 | 5 |
| 2005 | 3 | 6 |
| 2006 | 4 | 4 |
| 2007 | 1 | 4 |
| 2008 | 5 | 3 |
| 2009 | 4 | 6 |
| 2010 | 2 | 1 |
| 2011 | 3 | 5 |
| 2012 | 5 | 8 |
| 2013 | 1 | 9 |
| 2014 | 3 | 9 |
| 2015 | 8 | 16 |
| 2016 | 10 | 9 |
| 2017 | 7 | 6 |
| 2018 | 5 | 9 |
| 2019 | 15 | 10 |
| 2020 | 7 | 5 |
| 2021 | 8 | 6 |
| 2022 | 7 | 9 |
| 2023 | 3 | 6 |
| 2024 | 6 | 7 |
| 2025 | 4 | 6 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Discharge device for discharging electrical currents and machine comprising such a discharge device15 Sep 2026US 12,738,812 B2Audi AG
- Rotor shaft-mounted vapor chambers and heat pipes with endcap heat sinks for electric machines31 Mar 2026US 12,592,619 B2GM Global Technology Operations LLC
- Motor with end bell and electrical element holder17 Feb 2026US 12,556,064 B2Mabuchi Motor Co., Ltd.
- Power tool3 Feb 2026US 12,542,468 B2Makita Corporation
- Rotary-driven power generation device23 Dec 2025US 12,506,383 B2
- Drive unit for a motor vehicle, in particular for a car, and motor vehicle27 Aug 2026US 2026/0254311 A1Bayerische Motoren Werke Aktiengesellschaft
- Shaft Device for an Electric Machine, Electric Machine, and Motor Vehicle23 Jul 2026US 2026/0213620 A1Bayerische Motoren Werke Aktiengesellschaft
- Device for transmitting electrical current to a rotor of an electric machine5 Feb 2026US 2026/0039175 A1Schaeffler Technologies AG & Co. KG
- System and method for cooling carbon brushes and slip rings25 Dec 2025US 2025/0392195 A1Dana Automotive Systems Group, LLC
- Diverting device for diverting electrical currents, and machine comprising a diverting device of this type11 Dec 2025US 2025/0379408 A1
Most cited
By later US patents
- Totally enclosed electric motor81US 4,908,538 A1990
- Brushholder apparatus for dynamoelectric machine56US 4,329,611 AGeneral Electric Company · 1982
- Commutator type rotary electric machine50US 5,608,280 ANippondenso Co., Ltd. · 1997
- Permanent magnet direct current motor49US 5,949,173 AGeneral Electric Company · 1999
- Dual-face cooling fan for a dynamoelectric machine48US 4,961,016 AGeneral Motors Corporation · 1990