B60L 2220/20
Dc electrical machines
Official title: DC electrical machines
B60L2220/20 (Dc electrical machines) appears on 103 US grants and 91 published applications in this corpus.
Search patents in B60L- Granted patents
- 103
- Published applications
- 91
- Assignees
- 59
- Inventors
- 176
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 3 |
| 2003 | 2 | 3 |
| 2004 | 2 | 3 |
| 2005 | 3 | 5 |
| 2006 | 3 | 6 |
| 2007 | 4 | 0 |
| 2008 | 2 | 3 |
| 2009 | 2 | 4 |
| 2010 | 2 | 3 |
| 2011 | 5 | 3 |
| 2012 | 4 | 12 |
| 2013 | 5 | 6 |
| 2014 | 9 | 6 |
| 2015 | 4 | 2 |
| 2016 | 6 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 3 |
| 2019 | 2 | 0 |
| 2020 | 2 | 11 |
| 2021 | 5 | 4 |
| 2022 | 3 | 3 |
| 2023 | 3 | 1 |
| 2024 | 3 | 3 |
| 2025 | 1 | 5 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electric generator for electric vehicle28 Jul 2026US 12,691,747 B2Power Technology Holdings LLC
- Electric drive system, power train, vehicle, and method of operating an electric drive system17 Feb 2026US 12,552,263 B2Siemens Mobility GmbH
- Drive control device and drive device for railway vehicle13 Jan 2026US 12,522,256 B2Mitsubishi Electric Corporation
- Kart16 Dec 2025US 12,497,114 B2Razor USA LLC
- Process and an apparatus for controlling an electric motor10 Sep 2024US 12,088,233 B2Ferrari S.P. A.
- Kart9 Apr 2026US 2026/0097818 A1Razor USA LLC
- Hybrid electric aircraft propulsion system and method18 Sep 2025US 2025/0293627 A1Pratt & Whitney Canada Corp.
- A power system for driving an electric motor10 Jul 2025US 2025/0222775 A1
- Cold start induction heating and braking arrangement17 Apr 2025US 2025/0121696 A1Hamilton Sundstrand Corporation
- Collision avoidance system for mobility scooter20 Feb 2025US 2025/0058772 A1
Most cited
By later US patents
- Hybrid energy locomotive electrical power storage system151US 6,591,758 B2General Electric Company · 2003
- Power grid load management for plug-in vehicles145US 8,054,048 B2GM Global Technology Operations LLC · 2011
- Electric automobile108US 4,199,037 A1980
- Hybrid electric heavy-duty vehicle drive system105US 7,338,335 B12008
- Locomotive energy tender97US 6,612,245 B2Carl Rowold · 2003