H02J 9/067
Using multi-primary transformers
Official title: {using multi-primary transformers, e.g. transformer having one primary for each AC energy source and a secondary for the loads}
H02J9/067 (Using multi-primary transformers) appears on 61 US grants and 46 published applications in this corpus.
Search patents in H02J- Granted patents
- 61
- Published applications
- 46
- Assignees
- 44
- Inventors
- 109
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 5 | 4 |
| 2003 | 3 | 0 |
| 2004 | 1 | 2 |
| 2005 | 0 | 1 |
| 2006 | 3 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 3 |
| 2010 | 3 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 2 |
| 2013 | 1 | 1 |
| 2014 | 1 | 2 |
| 2015 | 2 | 2 |
| 2016 | 0 | 1 |
| 2017 | 6 | 3 |
| 2018 | 2 | 3 |
| 2019 | 4 | 4 |
| 2020 | 3 | 3 |
| 2021 | 3 | 4 |
| 2022 | 2 | 3 |
| 2023 | 2 | 0 |
| 2024 | 3 | 0 |
| 2025 | 0 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Dispatchable Decentralized Scalable Solar Generation Systems27 Feb 2025US 2025/0070562 A1Georgia Tech Research Corporation
- Power transforming apparatus and air conditioner including the same27 Oct 2022US 2022/0345067 A1LG Electronics Inc.
- Unit level isolated bus transfer device22 Sep 2022US 2022/0302845 A1Product Development Associates, Inc.
- Device for uninterruptible supply of power, comprising an energy storage means and a rotating electric machine2 Jun 2022US 2022/0173611 A1Piller Group GmbH
- Grid Interconnection System, Interconnection Control Device and Grid Interconnection Method2 Sep 2021US 2021/0273453 A1DAIHEN Corporation
Most cited
By later US patents
- Integrated uninterruptible power supply for personal computers428US 4,860,185 AElectronic Research Group, Inc. · 1989
- Uninterruptible power supply with direction of DC electrical energy depending on predetermined ratio303US 5,978,236 ASilverline Power Conversion LLC · 1999
- Power conversion and distribution system283US 5,982,645 ASquare D Company · 1999
- Co-generated power supply system93US 7,449,798 B2I-Hits Laboratory · 2008
- Uninterruptible power supplies using fuel cells62US 6,602,627 B2Alpha Technologies Inc. · 2003