H02H 3/286
Involving comparison of similar homopolar quantities
Official title: {involving comparison of similar homopolar quantities}
H02H3/286 (Involving comparison of similar homopolar quantities) appears on 25 US grants and 16 published applications in this corpus.
Search patents in H02H- Granted patents
- 25
- Published applications
- 16
- Assignees
- 20
- Inventors
- 61
- Latest grant
- 30 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 3 | 2 |
| 2004 | 3 | 2 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 2 | 1 |
| 2009 | 0 | 3 |
| 2010 | 1 | 0 |
| 2011 | 3 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Direct-current transmission line protection method and system based on pure current characteristics30 Apr 2024US 11,973,340 B2China Electric Power Research Institute
- Boundary separation scheme for faults in power systems15 Nov 2022US 11,500,407 B2Schweitzer Engineering Laboratories, Inc.
- Zero sequence current based line differential protection solution11 Oct 2022US 11,469,589 B2Hitachi Energy Switzerland AG
- Method and apparatus for differential protection of an electric connection23 Aug 2016US 9,425,609 B2ABB Technology AG
- Method and device for protecting an autotransformer for an aircraft20 May 2014US 8,730,633 B2Airbus Operations GmbH
- Direct-current transmission line protection method and system based on pure current characteristics8 Sep 2022US 2022/0285931 A1China Electric Power Research Institute
- Boundary separation scheme for faults in power systems19 Aug 2021US 2021/0255655 A1Schweitzer Engineering Laboratories, Inc.
- New Zero Sequence Current Based Line Differential Protection Solution22 Oct 2020US 2020/0335967 A1Hitachi Energy Switzerland AG
- Method and device for protecting an autotransformer for an aircraft7 Mar 2013US 2013/0057059 A1Airbus Operations GmbH
- Method and apparatus for differential protection of an electric connection7 Feb 2013US 2013/0035882 A1ABB Technology AG
Most cited
By later US patents
- Fault type selection system for identifying faults in an electric power system50US 6,525,543 B1Schweitzer Engineering Laboratories, Inc. · 2003
- Apparatus and method for providing differential protection for a phase angle regulating transformer in a power system34US 7,319,576 B2Schweitzer Engineering Labortories, Inc. · 2008
- Method and device for fault detection in transformers or power lines32US 7,812,615 B2ABB AB · 2010
- Ground fault detection system26US 6,678,132 B1BAE Systems Controls Inc. · 2004
- Methods and apparatus for differential current measurement in a three-phase power system25US 6,507,184 B1ABB Automation Inc. · 2003