- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 1/74 - Interface circuits for coupling substations to external telephone lines with means for reducing interferenceInterface circuits for coupling substations to external telephone lines with means for reducing effects due to line faults
Patent holdings for IPC class H04M 1/74
Total number of patents in this class: 40
10-year publication summary
|
4
|
7
|
6
|
2
|
1
|
1
|
0
|
2
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Boyce Technologies Inc. | 7 |
6 |
| Illinois Tool Works Inc. | 11387 |
3 |
| Enginuity Communications Corporation | 12 |
3 |
| Canon Inc. | 39119 |
2 |
| Apple Inc. | 54076 |
1 |
| Sony Corporation | 31227 |
1 |
| Sony Ericsson Mobile Communications AB | 1830 |
1 |
| Intel Corporation | 46639 |
1 |
| Hon Hai Precision Industry Co., Ltd. | 4034 |
1 |
| Alcatel Lucent SA | 1606 |
1 |
| Huawei Technologies Co., Ltd. | 109769 |
1 |
| STMicroelectronics (Tours) SAS | 204 |
1 |
| RPX Corporation | 1365 |
1 |
| JVC Kenwood Corporation | 2967 |
1 |
| China Mobile Communications Corporation | 574 |
1 |
| Corning Optical Communications LLC | 1791 |
1 |
| Fu Tai Hua Industry (Shenzhen) Co., Ltd. | 312 |
1 |
| MaxLinear, Inc. | 790 |
1 |
| Mitel Networks Corporation | 172 |
1 |
| Phoenix Contact GmbH & Co. KG | 2260 |
1 |
| Other owners | 10 |