- 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: 25
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 | 288 |
3 |
| Patent Armory Inc. | 15 |
3 |
| Wilmington Savings Fund Society, FSB | 345 |
2 |
| Apple Inc. | 58742 |
1 |
| BlackBerry Limited | 4898 |
1 |
| NEC Corporation | 37004 |
1 |
| Huawei Technologies Co., Ltd. | 123385 |
1 |
| ZTE Corporation | 44170 |
1 |
| Microsoft Technology Licensing, LLC | 54466 |
1 |
| Amazing Microelectronic Corp. | 94 |
1 |
| Microsemi Corporation | 111 |
1 |
| Nokia Siemens Networks Oy | 1510 |
1 |
| Nuvoton Technology Corporation | 679 |
1 |
| Sagemcom Broadband SAS | 488 |
1 |
| Skyworks Solutions, Inc. | 3950 |
1 |
| Unify GmbH & Co. KG | 71 |
1 |
| Symbol Technologies, LLC | 1130 |
1 |
| Microsemi P.O.E. Ltd. | 25 |
1 |
| Telefonaktiebolaget LM Ericsson (publ) | 28758 |
1 |
| Actutek Corporation | 851 |
1 |
| Other owners | 0 |