- 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: 3136
10-year publication summary
|
348
|
272
|
278
|
225
|
222
|
208
|
240
|
189
|
160
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Ricoh Company, Ltd. | 13222 |
148 |
| Microsoft Technology Licensing, LLC | 52911 |
126 |
| Dolby Laboratories Licensing Corporation | 4063 |
110 |
| Google LLC | 40924 |
85 |
| Cisco Technology, Inc. | 19412 |
82 |
| Hewlett-Packard Development Company, L.P. | 27447 |
74 |
| People.ai, Inc. | 136 |
64 |
| International Business Machines Corporation | 60178 |
55 |
| Huawei Technologies Co., Ltd. | 106915 |
51 |
| BlackBerry Limited | 5871 |
43 |
| RingCentral, Inc. | 738 |
42 |
| Level 3 Communications, LLC | 1241 |
39 |
| NEC Corporation | 34467 |
36 |
| Qualcomm Incorporated | 82009 |
35 |
| West Technology Group, LLC | 414 |
34 |
| Malikie Innovations Limited | 7367 |
32 |
| Vonage Business Inc. | 173 |
30 |
| Arlington Technologies, LLC | 635 |
30 |
| ZTE Corporation | 41096 |
28 |
| Avaya Inc. | 1447 |
28 |
| Other owners | 1964 |