H02P 7/288
Using variable impedance
Official title: using variable impedance
H02P7/288 (Using variable impedance) appears on 142 US grants and 25 published applications in this corpus.
Search patents in H02P- Granted patents
- 142
- Published applications
- 25
- Assignees
- 95
- Inventors
- 218
- Latest grant
- 27 Apr 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 6 | 0 |
| 1980 | 8 | 0 |
| 1981 | 8 | 0 |
| 1982 | 8 | 0 |
| 1983 | 6 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 6 | 0 |
| 2002 | 1 | 0 |
| 2003 | 3 | 4 |
| 2004 | 2 | 1 |
| 2005 | 2 | 2 |
| 2006 | 1 | 3 |
| 2007 | 1 | 3 |
| 2008 | 2 | 3 |
| 2009 | 2 | 1 |
| 2010 | 5 | 2 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Load driving circuit27 Apr 2021US 10,992,244 B2Rohm Co., Ltd.
- Electronic fitness device17 Nov 2015US 9,190,950 B2
- Method and apparatus for quiet fan speed control5 Jun 2012US 8,193,744 B2Lutron Electronics Co., Inc.
- Power transistor with turn off control and method for operating4 Oct 2011US 8,030,986 B2Freescale Semiconductor, Inc.
- Series resistor assembly for an electric motor, circuit arrangement comprising a series resistor assembly for operating an electric motor and use of said assembly27 Apr 2010US 7,705,549 B2Behr GmbH & Co.
- System and method for load torque disturbance rejection of brushed dc motors18 Sep 2025US 2025/0293625 A1
- Stepless speed control circuit of electric sprayer16 Apr 2020US 2020/0119671 A1Suzhou Crosstec Co., Ltd.
- Load driving circuit16 Jan 2020US 2020/0021215 A1Rohm Co., Ltd.
- Electronic fitness device6 Mar 2014US 2014/0062347 A1
- Rotation speed control device for a heat-dissipating fan12 Jan 2012US 2012/0007534 A1NS Micro Motor Technology Corp.
Most cited
By later US patents
- Motor controller for a dental handpiece1,072US 5,980,248 AKabushiki Kaisha Morita Seisakusho · 1999
- Speed control system for small medical motors993US 4,494,057 AKabushiki Kaisha Morita Seisakusho · 1985
- Direct current motor safety circuits for fluid delivery systems321US 6,259,587 B1MiniMed Inc. · 2001
- Direct current motor speed control140US 4,893,067 ABlack & Decker Inc. · 1990
- Control motor integrated with a direct current motor and a speed control circuit100US 5,119,466 AASMO Co.LTD · 1992