- All sections
- H - Electricity
- H01F - Magnetsinductancestransformersselection of materials for their magnetic properties
- H01F 29/04 - Variable transformers or inductances not covered by group with tappings on coil or windingVariable transformers or inductances not covered by group with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
Patent holdings for IPC class H01F 29/04
Total number of patents in this class: 259
10-year publication summary
|
11
|
13
|
8
|
13
|
19
|
19
|
16
|
10
|
10
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Maschinenfabrik Reinhausen GmbH | 582 |
87 |
| Kabushiki Kaisha Toshiba, doing business as Toshiba Corporation | 6181 |
18 |
| Hitachi Energy Ltd. | 2568 |
17 |
| Toshiba Energy Systems & Solutions Corp. | 1150 |
14 |
| Siemens AG | 24033 |
8 |
| Shanghai Huaming Power Equipment Co., Ltd | 16 |
7 |
| State Grid Corporation of China | 1399 |
6 |
| GE Infrastructure Technology, LLC | 6171 |
6 |
| ABB Power Grids Switzerland AG | 212 |
5 |
| Wujiang Transformer Co., Ltd. | 40 |
4 |
| Beijing Aerospace Control Device Institute | 4 |
4 |
| Wuhan Taipu Transformer Changer Co., Ltd. | 3 |
3 |
| China Electric Power Research Institute Company Limited | 142 |
3 |
| ABB Bulgaria EOOD | 3 |
3 |
| ABB Technology Ltd | 435 |
3 |
| Alstom Technology Ltd | 1045 |
2 |
| ABB Schweiz AG | 7590 |
2 |
| China Electric Power Research Institute | 300 |
2 |
| Electric Power Research Institute, China Southern Power Grid | 257 |
2 |
| Schweitzer Engineering Laboratories, Inc. | 907 |
2 |
| Other owners | 61 |