- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 15/20 - Operator's time recording or indicating arrangements
Patent holdings for IPC class H04M 15/20
Total number of patents in this class: 2
10-year publication summary
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0
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0
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0
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0
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nokia Siemens Networks GmbH & Co. KG | 614 |
1 |
| Vodafone IP Licensing Limited | 272 |
1 |
| Other owners | 0 |