- 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: 301
10-year publication summary
|
45
|
29
|
28
|
12
|
14
|
10
|
11
|
15
|
9
|
2
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| British Telecommunications Public Limited Company | 2575 |
55 |
| Alcatel Lucent | 4720 |
26 |
| Telefonaktiebolaget LM Ericsson (publ) | 26435 |
18 |
| Adaptive Spectrum and Signal Alignment, Inc. | 137 |
16 |
| Huawei Technologies Co., Ltd. | 100781 |
14 |
| PassiveLogic, Inc. | 148 |
13 |
| Adtran, Inc. | 443 |
9 |
| AT&T Intellectual Property I, L.P. | 9886 |
8 |
| Ericsson | 20417 |
8 |
| Assia SPE LLC, c/o The Corporation Trust Company | 108 |
8 |
| ZTE Corporation | 39218 |
6 |
| Tollgrade Communications, Inc. | 28 |
6 |
| RPX Corporation | 1571 |
5 |
| Nokia Solutions And Networks Oy | 5698 |
5 |
| Nokia Siemens Networks Oy | 1582 |
5 |
| ADTRAN GmbH | 26 |
4 |
| CenturyLink Intellectual Property LLC | 1130 |
4 |
| Level 3 Communications, LLC | 1428 |
4 |
| Viavi Solutions Inc. | 1363 |
4 |
| Alcatel Lucent SA | 1723 |
3 |
| Other owners | 80 |