- All sections
- H - Electricity
- H04L - Transmission of digital information, e.g. telegraphic communication
- H04L 61/4557 - Directories for hybrid networks, e.g. including telephone numbers
Patent holdings for IPC class H04L 61/4557
Total number of patents in this class: 29
10-year publication summary
|
1
|
0
|
0
|
1
|
1
|
5
|
6
|
8
|
7
|
0
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| AT&T Intellectual Property I, L.P. | 9886 |
4 |
| Nippon Telegraph and Telephone Corporation | 14195 |
3 |
| Google LLC | 38759 |
2 |
| T-Mobile USA, Inc. | 3668 |
2 |
| Research In Motion Limited | 2283 |
1 |
| Bank of America Corporation | 6495 |
1 |
| Microsoft Technology Licensing, LLC | 51439 |
1 |
| 3G Licensing S.A. | 126 |
1 |
| Charter Communications Operating, LLC | 1054 |
1 |
| iControl Networks, Inc. | 253 |
1 |
| Mitel Networks Corporation | 455 |
1 |
| Somos, Inc. | 101 |
1 |
| TextNow, Inc. | 43 |
1 |
| Syndefense Corp | 14 |
1 |
| Tech-friends Ltd. | 2 |
1 |
| PAX S&T Co., Ltd | 3 |
1 |
| Acromate Co., Ltd. | 4 |
1 |
| Duzzcall (Pvt) Ltd | 2 |
1 |
| Avea Media Inc. | 1 |
1 |
| Aptiv Technologies AG | 2097 |
1 |
| Other owners | 2 |