- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/56 - Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
Patent holdings for IPC class H04M 3/56
Total number of patents in this class: 3161
10-year publication summary
|
339
|
265
|
273
|
221
|
219
|
207
|
237
|
191
|
163
|
94
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ricoh Company, Ltd. | 13368 |
148 |
| Microsoft Technology Licensing, LLC | 54340 |
126 |
| Dolby Laboratories Licensing Corporation | 4205 |
111 |
| Google LLC | 43134 |
85 |
| Cisco Technology, Inc. | 22107 |
82 |
| Hewlett-Packard Development Company, L.P. | 25577 |
74 |
| People.ai, Inc. | 141 |
70 |
| International Business Machines Corporation | 61747 |
54 |
| Huawei Technologies Co., Ltd. | 116003 |
50 |
| RingCentral, Inc. | 779 |
45 |
| Level 3 Communications, LLC | 1279 |
38 |
| Qualcomm Incorporated | 87720 |
37 |
| Zoom Communications, Inc. | 881 |
34 |
| BlackBerry Limited | 5261 |
33 |
| NEC Corporation | 36282 |
32 |
| Malikie Innovations Limited | 6931 |
32 |
| West Technology Group, LLC | 409 |
31 |
| Vonage Business Inc. | 176 |
30 |
| Arlington Technologies, LLC | 621 |
30 |
| Amazon Technologies, Inc. | 27247 |
28 |
| Other owners | 1991 |