- 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: 3094
10-year publication summary
|
387
|
348
|
272
|
278
|
225
|
222
|
205
|
234
|
182
|
53
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ricoh Company, Ltd. | 13266 |
156 |
| Microsoft Technology Licensing, LLC | 51439 |
120 |
| Dolby Laboratories Licensing Corporation | 3883 |
108 |
| Cisco Technology, Inc. | 18858 |
84 |
| Hewlett-Packard Development Company, L.P. | 28538 |
73 |
| Google LLC | 38759 |
71 |
| International Business Machines Corporation | 60644 |
57 |
| People.ai, Inc. | 125 |
54 |
| Huawei Technologies Co., Ltd. | 100781 |
51 |
| BlackBerry Limited | 5958 |
43 |
| RingCentral, Inc. | 731 |
41 |
| Level 3 Communications, LLC | 1428 |
37 |
| NEC Corporation | 32703 |
35 |
| Zoom Video Communications, Inc. | 819 |
35 |
| Qualcomm Incorporated | 76576 |
34 |
| West Technology Group, LLC | 414 |
34 |
| Malikie Innovations Limited | 7703 |
32 |
| Vonage Business Inc. | 171 |
30 |
| Arlington Technologies, LLC | 642 |
30 |
| Nokia Corporation | 6965 |
28 |
| Other owners | 1941 |