- 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: 3153
10-year publication summary
|
348
|
273
|
278
|
226
|
223
|
211
|
241
|
192
|
162
|
70
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ricoh Company, Ltd. | 13279 |
147 |
| Microsoft Technology Licensing, LLC | 53739 |
125 |
| Dolby Laboratories Licensing Corporation | 4126 |
111 |
| Google LLC | 42292 |
84 |
| Cisco Technology, Inc. | 19950 |
82 |
| Hewlett-Packard Development Company, L.P. | 25869 |
74 |
| People.ai, Inc. | 140 |
69 |
| International Business Machines Corporation | 61287 |
56 |
| Huawei Technologies Co., Ltd. | 113006 |
49 |
| RingCentral, Inc. | 764 |
45 |
| Level 3 Communications, LLC | 1262 |
39 |
| Qualcomm Incorporated | 85550 |
36 |
| NEC Corporation | 35734 |
33 |
| Malikie Innovations Limited | 7127 |
32 |
| Vonage Business Inc. | 172 |
31 |
| West Technology Group, LLC | 406 |
31 |
| Arlington Technologies, LLC | 624 |
30 |
| Zoom Communications, Inc. | 720 |
30 |
| BlackBerry Limited | 5141 |
29 |
| Amazon Technologies, Inc. | 26741 |
28 |
| Other owners | 1992 |