- 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: 29
10-year publication summary
|
5
|
3
|
2
|
2
|
2
|
2
|
1
|
0
|
1
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| CSC Holdings, LLC | 293 |
3 |
| Patent Armory Inc. | 15 |
3 |
| Huawei Technologies Co., Ltd. | 113689 |
2 |
| Wilmington Savings Fund Society, FSB | 368 |
2 |
| Apple Inc. | 55387 |
1 |
| BlackBerry Limited | 5352 |
1 |
| NEC Corporation | 35935 |
1 |
| British Telecommunications Public Limited Company | 2630 |
1 |
| ZTE Corporation | 42693 |
1 |
| Microsoft Technology Licensing, LLC | 53891 |
1 |
| Amazing Microelectronic Corp. | 85 |
1 |
| Microsemi Corporation | 117 |
1 |
| Nokia Siemens Networks GmbH & Co. KG | 440 |
1 |
| Nokia Siemens Networks Oy | 1533 |
1 |
| Nuvoton Technology Corporation | 616 |
1 |
| Sagemcom Broadband SAS | 462 |
1 |
| Skyworks Solutions, Inc. | 3750 |
1 |
| TDK Taiwan Corp. | 808 |
1 |
| Unify GmbH & Co. KG | 71 |
1 |
| Symbol Technologies, LLC | 1193 |
1 |
| Other owners | 3 |