- 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: 26
10-year publication summary
|
3
|
2
|
2
|
2
|
2
|
1
|
0
|
1
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| CSC Holdings, LLC | 289 |
3 |
| Patent Armory Inc. | 15 |
3 |
| Wilmington Savings Fund Society, FSB | 354 |
2 |
| Apple Inc. | 58049 |
1 |
| BlackBerry Limited | 5003 |
1 |
| NEC Corporation | 36611 |
1 |
| Huawei Technologies Co., Ltd. | 119891 |
1 |
| ZTE Corporation | 43576 |
1 |
| Microsoft Technology Licensing, LLC | 54215 |
1 |
| Amazing Microelectronic Corp. | 90 |
1 |
| Microsemi Corporation | 112 |
1 |
| Nokia Siemens Networks Oy | 1521 |
1 |
| Nuvoton Technology Corporation | 648 |
1 |
| Sagemcom Broadband SAS | 476 |
1 |
| Skyworks Solutions, Inc. | 3884 |
1 |
| TDK Taiwan Corp. | 818 |
1 |
| Unify GmbH & Co. KG | 71 |
1 |
| Symbol Technologies, LLC | 1160 |
1 |
| Microsemi P.O.E. Ltd. | 25 |
1 |
| Telefonaktiebolaget LM Ericsson (publ) | 28615 |
1 |
| Other owners | 1 |