- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/02 - Calling substations, e.g. by ringing
Patent holdings for IPC class H04M 3/02
Total number of patents in this class: 228
10-year publication summary
|
52
|
33
|
25
|
16
|
17
|
9
|
10
|
7
|
8
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Microsoft Technology Licensing, LLC | 52933 |
11 |
| Theatro Labs, Inc. | 63 |
10 |
| NEC Corporation | 34540 |
8 |
| AT&T Intellectual Property I, L.P. | 9347 |
7 |
| Huawei Technologies Co., Ltd. | 107154 |
7 |
| RingCentral, Inc. | 739 |
6 |
| Malikie Innovations Limited | 7353 |
6 |
| Samsung Electronics Co., Ltd. | 139551 |
5 |
| Verizon Patent And Licensing Inc. | 6951 |
5 |
| Callyo 2009 Corp. | 43 |
5 |
| Conversation Processing Intelligence Corp. | 13 |
5 |
| Nokia Technologies Oy | 16656 |
4 |
| Google LLC | 40989 |
4 |
| BlackBerry Limited | 5869 |
3 |
| Qualcomm Incorporated | 82165 |
3 |
| Sony Corporation | 31518 |
3 |
| Panasonic Intellectual Property Management Co., Ltd. | 29895 |
3 |
| ZTE Corporation | 41154 |
3 |
| 8x8, Inc. | 426 |
3 |
| BCE Inc. | 414 |
3 |
| Other owners | 124 |