H02P 7/281
The dc motor being operated in four quadrants
Official title: the DC motor being operated in four quadrants
H02P7/281 (The dc motor being operated in four quadrants) appears on 106 US grants and 28 published applications in this corpus.
Search patents in H02P- Granted patents
- 106
- Published applications
- 28
- Assignees
- 61
- Inventors
- 162
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 8 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 6 | 0 |
| 1983 | 8 | 0 |
| 1984 | 13 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 2 |
| 2003 | 1 | 2 |
| 2004 | 1 | 1 |
| 2005 | 2 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 1 | 6 |
| 2009 | 6 | 0 |
| 2010 | 0 | 2 |
| 2011 | 1 | 4 |
| 2012 | 1 | 2 |
| 2013 | 3 | 0 |
| 2014 | 2 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Automatic motion damping of teleoperated surgical system manipulators5 Aug 2025US 12,376,925 B2Intuitive Surgical Operations, Inc.
- Abnormality monitoring apparatus12 Nov 2024US 12,143,055 B2Denso Corporation
- Linear and nonlinear dynamic bus control for AFE applications12 Oct 2021US 11,146,180 B2Rockwell Automation Technologies, Inc.
- Operation device9 Jul 2019US 10,345,917 B2Kabushiki Kaisha Tokai Rika Denki Seisakusho
- Motor driving device25 Oct 2016US 9,479,093 B2Nidec Servo Corporation
- Method for absorbing energy in an electric drive system, and electric drive system4 Sep 2025US 2025/0279736 A1Bode—Die TüR GmbH
- Automatic motion damping of teleoperated surgical system manipulators4 May 2023US 2023/0138396 A1Intuitive Surgical Operations, Inc.
- Abnormality monitoring apparatus8 Dec 2022US 2022/0393624 A1Denso Corporation
- Linear and nonlinear dynamic bus control for afe applications6 May 2021US 2021/0135589 A1Rockwell Automation Technologies, Inc.
- Operation device5 Jul 2018US 2018/0188821 A1Kabushiki Kaisha Tokai Rika Denki Seisakusho
Most cited
By later US patents
- Four quadrant unipolar pulse width modulated inverter97US 5,428,522 AKaman Electromagnetics Corporation · 1995
- Electric wheelchair with speed control circuit70US 4,387,325 AInvacare Corporation · 1983
- Electric wheelchair with improved control circuit69US 4,511,825 AInvacare Corporation · 1985
- Electric wheelchair with improved control circuit55US 4,634,941 AInvacare Corporation · 1987
- Electric wheel50US 4,223,255 A1980