- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/20 - Automatic or semi-automatic exchanges with means for interrupting existing connectionsAutomatic or semi-automatic exchanges with means for breaking-in on conversations
Patent holdings for IPC class H04M 3/20
Total number of patents in this class: 80
10-year publication summary
|
8
|
11
|
11
|
9
|
6
|
4
|
5
|
0
|
2
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Tevnos LLC | 16 |
9 |
| Comcast Cable Communications, LLC | 5038 |
5 |
| Callyo 2009 Corp. | 43 |
4 |
| Sun Patent Trust | 2003 |
4 |
| BlackBerry Limited | 4997 |
3 |
| AT&T Intellectual Property I, L.P. | 9836 |
3 |
| Global Tel*Link Corporation | 434 |
3 |
| I.m.n.a. Solutions Ltd | 6 |
3 |
| Huawei Technologies Co., Ltd. | 120098 |
2 |
| ZTE Corporation | 43598 |
2 |
| Avaya Inc. | 1331 |
2 |
| Motorola Solutions, Inc. | 4519 |
2 |
| Value-Added Communications, Inc. | 13 |
2 |
| Wells Fargo Bank, National Association | 4350 |
2 |
| Research In Motion Limited | 1412 |
1 |
| Qualcomm Incorporated | 90221 |
1 |
| International Business Machines Corporation | 62220 |
1 |
| Honeywell International Inc. | 12786 |
1 |
| AT&T Corporation | 97 |
1 |
| Bank of America Corporation | 8185 |
1 |
| Other owners | 28 |