- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 19/02 - Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Patent holdings for IPC class H04M 19/02
Total number of patents in this class: 30
10-year publication summary
|
4
|
5
|
3
|
2
|
2
|
2
|
2
|
1
|
0
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| CSC Holdings, LLC | 261 |
3 |
| Unify GmbH & Co. KG | 142 |
3 |
| Patent Armory Inc. | 16 |
3 |
| Huawei Technologies Co., Ltd. | 100781 |
2 |
| Telefonaktiebolaget LM Ericsson (publ) | 26435 |
2 |
| Apple Inc. | 50209 |
1 |
| BlackBerry Limited | 5958 |
1 |
| NEC Corporation | 32703 |
1 |
| British Telecommunications Public Limited Company | 2575 |
1 |
| ZTE Corporation | 39218 |
1 |
| Microsoft Technology Licensing, LLC | 51439 |
1 |
| Condition30 Inc. | 1 |
1 |
| Microsemi Corporation | 125 |
1 |
| Nokia Siemens Networks GmbH & Co. KG | 614 |
1 |
| Nokia Siemens Networks Oy | 1582 |
1 |
| Sagemcom Broadband SAS | 421 |
1 |
| Skyworks Solutions, Inc. | 3450 |
1 |
| TDK Taiwan Corp. | 694 |
1 |
| Symbol Technologies, LLC | 1308 |
1 |
| Microsemi P.O.E. Ltd. | 25 |
1 |
| Other owners | 2 |