- All sections
- H - Electricity
- H04B - Transmission
- H04B 3/20 - Reducing echo effects or singingOpening or closing transmitting pathConditioning for transmission in one direction or the other
Patent holdings for IPC class H04B 3/20
Total number of patents in this class: 471
10-year publication summary
|
33
|
29
|
31
|
18
|
9
|
16
|
11
|
9
|
9
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cisco Technology, Inc. | 22112 |
18 |
| Realtek Semiconductor Corp. | 3351 |
17 |
| Amazon Technologies, Inc. | 27237 |
16 |
| Microsoft Technology Licensing, LLC | 54319 |
15 |
| Marvell Asia PTE, Ltd. | 6427 |
13 |
| Cavium International | 4918 |
13 |
| Huawei Technologies Co., Ltd. | 115827 |
11 |
| Samsung Electronics Co., Ltd. | 149087 |
10 |
| Avago Technologies International Sales Pte. Limited | 8663 |
10 |
| Spotify AB | 986 |
9 |
| Cerence Inc. | 269 |
8 |
| Cerence Operating Company | 425 |
8 |
| Yamaha Corporation | 4062 |
7 |
| Dolby Laboratories Licensing Corporation | 4202 |
7 |
| Google LLC | 43094 |
7 |
| Apple Inc. | 56283 |
6 |
| MaxLinear, Inc. | 850 |
6 |
| BlackBerry Limited | 5266 |
5 |
| Fujitsu Limited | 17652 |
5 |
| ClearOne Inc. | 108 |
5 |
| Other owners | 275 |