Y02E 40/20
Active power filtering [apf]
Official title: Active power filtering [APF]
Y02E40/20 (Active power filtering [apf]) appears on 355 US grants and 314 published applications in this corpus.
Search patents in Y02E- Granted patents
- 355
- Published applications
- 314
- Assignees
- 200
- Inventors
- 776
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 7 | 0 |
| 1997 | 5 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 2 |
| 2002 | 4 | 7 |
| 2003 | 7 | 5 |
| 2004 | 2 | 4 |
| 2005 | 10 | 12 |
| 2006 | 6 | 6 |
| 2007 | 7 | 7 |
| 2008 | 6 | 8 |
| 2009 | 3 | 9 |
| 2010 | 11 | 8 |
| 2011 | 7 | 14 |
| 2012 | 10 | 25 |
| 2013 | 12 | 17 |
| 2014 | 21 | 22 |
| 2015 | 13 | 17 |
| 2016 | 17 | 23 |
| 2017 | 18 | 21 |
| 2018 | 30 | 26 |
| 2019 | 24 | 17 |
| 2020 | 19 | 16 |
| 2021 | 19 | 18 |
| 2022 | 12 | 10 |
| 2023 | 18 | 10 |
| 2024 | 6 | 4 |
| 2025 | 6 | 3 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Utilization of distributed generator inverters as statcom22 Sep 2026US 12,744,380 B2
- Use of distributed generator (DG) inverters as STATCOMs for decreasing line losses18 Aug 2026US 12,710,780 B2
- Single-phase voltage source inverter circuit with power filter reduction21 Apr 2026US 12,609,604 B2
- Active power conversion apparatus, system, and method for use in active power conversion apparatus6 Jan 2026US 12,519,320 B2Huawei Digital Power Technologies Co., Ltd.
- Energy transactions with distributed energy resources and distributed grid management25 Nov 2025US 12,483,035 B2Apparent Labs, LLC
- Power Converter Device With An Integrated Control Scheme27 Aug 2026US 2026/0254246 A1Aros Electronics AB
- Control system30 Apr 2026US 2026/0121405 A1Konkuk University Industrial Cooperation Corp.
- Utilization of distributed generator inverters as statcom29 Jan 2026US 2026/0031623 A1
- User-installable part installation detection techniques13 Nov 2025US 2025/0347587 A1Intuitive Surgical Operations, Inc.
- Multi-level medium voltage data center static synchronous compensator (dcstatcom) for active and reactive power control of data centers connected with grid energy storage and smart green distributed energy sources6 Nov 2025US 2025/0343419 A1Inertech IP LLC
Most cited
By later US patents
- Apparatus and method for dynamic voltage restoration of utility distribution networks274US 5,329,222 AWestinghouse Electric Corp. · 1994
- Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation266US 5,225,712 AU.S. Windpower, Inc. · 1993
- Variable speed wind turbine245US 5,083,039 AU.S. Windpower, Inc. · 1992
- System for reducing harmonics by harmonic current injection194US 5,499,178 ARegents of the University of Minnesota · 1996
- Multilevel cascade voltage source inverter with seperate DC sources182US 5,642,275 ALockheed Martin Energy System, Inc. · 1997