- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/04 - Calling substations, e.g. by ringing the calling signal being supplied from the final selector
Patent holdings for IPC class H04M 3/04
Total number of patents in this class: 13
10-year publication summary
|
2
|
0
|
1
|
1
|
0
|
0
|
0
|
1
|
0
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Verizon Patent And Licensing Inc. | 6900 |
2 |
| Mitel Networks, Inc. | 174 |
2 |
| ShoreTel, Inc. | 151 |
2 |
| Sorenson IP Holdings, LLC | 287 |
2 |
| Samsung Electronics Co., Ltd. | 131630 |
1 |
| Ericsson | 20417 |
1 |
| Globetouch, Inc. | 8 |
1 |
| Tencent Technology (Shenzhen) Company Limited | 12951 |
1 |
| Promptlink Communications, Inc. | 27 |
1 |
| Other owners | 0 |