H02J 3/34
Arrangements for transfer of electric power between networks of substantially different frequency
H02J3/34 (Arrangements for transfer of electric power between networks of substantially different frequency) appears on 124 US grants and 134 published applications in this corpus.
Search patents in H02J- Granted patents
- 124
- Published applications
- 134
- Assignees
- 96
- Inventors
- 329
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 1 |
| 2003 | 0 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 3 |
| 2010 | 0 | 3 |
| 2011 | 3 | 7 |
| 2012 | 3 | 10 |
| 2013 | 7 | 8 |
| 2014 | 4 | 7 |
| 2015 | 8 | 13 |
| 2016 | 4 | 4 |
| 2017 | 7 | 12 |
| 2018 | 9 | 5 |
| 2019 | 13 | 11 |
| 2020 | 13 | 8 |
| 2021 | 7 | 6 |
| 2022 | 3 | 6 |
| 2023 | 4 | 9 |
| 2024 | 5 | 5 |
| 2025 | 9 | 6 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Dynamic frequency coordination control method for asynchronous regional power grids during wet and dry seasons19 Mar 2026US 2026/0081428 A1Kunming University of Science and Technology
- Dynamic frequency coordination control method combining frequency synchronous control in vsc-hvdc with bilateral frequency limit control in lcc-hvdc12 Mar 2026US 2026/0074520 A1Kunming University of Science and Technology
Most cited
By later US patents
- Distributed system and methodology of electrical power regulation, conditioning and distribution on an aircraft62US 6,778,414 B2The Boeing Company · 2004
- Aircraft electrical power system including air conditioning system generator54US 5,939,800 AAlliedSignal Inc. · 1999
- System and method for routing power across multiple microgrids having DC and AC buses50US 8,447,435 B1Science Applications International Corporation · 2013
- Converter enhanced variable frequency power bus architecture43US 5,627,744 ASundstrand Corporation · 1997
- Phase modulated, resonant power converting high frequency link inverter/converter42US 4,661,897 AAllied Corporation · 1987