- All sections
- H - Electricity
- H02H - Emergency protective circuit arrangements
- H02H 3/28 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to difference between voltages or between currentsEmergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
Patent holdings for IPC class H02H 3/28
Total number of patents in this class: 135
10-year publication summary
|
10
|
9
|
13
|
8
|
9
|
7
|
4
|
7
|
12
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kabushiki Kaisha Toshiba, doing business as Toshiba Corporation | 6271 |
12 |
| Mitsubishi Electric Corporation | 46295 |
9 |
| ABB Schweiz AG | 7009 |
9 |
| General Electric Technology GmbH | 1372 |
8 |
| Siemens AG | 24436 |
7 |
| Hubbell Incorporated | 3286 |
7 |
| Hitachi Energy Ltd. | 2240 |
6 |
| ABB Technology AG | 1252 |
5 |
| Itron, Inc. | 886 |
3 |
| Schweitzer Engineering Laboratories, Inc. | 915 |
3 |
| Toshiba Energy Systems & Solutions Corp. | 1085 |
3 |
| ABB Technology Ltd | 478 |
3 |
| Toshiba Corporation | 12383 |
2 |
| Hitachi, Ltd. | 15531 |
2 |
| The Governing Council of The University of Toronto, | 1478 |
2 |
| Schneider Electric USA, Inc. | 1286 |
2 |
| Server Technology, Inc. | 30 |
2 |
| Universidade Estadual de Campinas - Unicamp | 274 |
2 |
| VoltServer, Inc. | 48 |
2 |
| Eaton Intelligent Power Limited | 6009 |
2 |
| Other owners | 44 |