- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 1/715 - Substation extension arrangements using two or more extensions per line
Patent holdings for IPC class H04M 1/715
Total number of patents in this class: 3
10-year publication summary
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0
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0
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0
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2
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0
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0
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0
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0
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0
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0
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Telegraph and Telephone West Corporation | 25 |
1 |
| Nippon Telegraph And Telephone East Corporation | 25 |
1 |
| NEC Platforms, Ltd. | 1146 |
1 |
| Other owners | 0 |