- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/30 - Automatic routine testing for subscribers' lines
Patent holdings for IPC class H04M 3/30
Total number of patents in this class: 296
10-year publication summary
|
28
|
12
|
14
|
10
|
11
|
20
|
11
|
12
|
6
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| British Telecommunications Public Limited Company | 2600 |
59 |
| PassiveLogic, Inc. | 241 |
27 |
| Alcatel Lucent | 4333 |
23 |
| Telefonaktiebolaget LM Ericsson (publ) | 28744 |
15 |
| Adaptive Spectrum and Signal Alignment, Inc. | 100 |
14 |
| Huawei Technologies Co., Ltd. | 123282 |
12 |
| Adtran, Inc. | 405 |
9 |
| AT&T Intellectual Property I, L.P. | 9993 |
7 |
| Ericsson | 22660 |
7 |
| ZTE Corporation | 44159 |
6 |
| Viavi Solutions Inc. | 1533 |
6 |
| Nokia Solutions And Networks Oy | 7196 |
5 |
| CenturyLink Intellectual Property LLC | 1275 |
5 |
| Level 3 Communications, LLC | 1251 |
5 |
| Nokia Siemens Networks Oy | 1510 |
5 |
| Tollgrade Communications, Inc. | 21 |
5 |
| Assia SPE LLC, c/o The Corporation Trust Company | 91 |
5 |
| RPX Corporation | 1149 |
4 |
| ADTRAN GmbH | 27 |
4 |
| Telecom Italia S.p.A. | 966 |
4 |
| Other owners | 69 |