- All sections
- H - Electricity
- H04B - Transmission
- H04B 3/20 - Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Patent holdings for IPC class H04B 3/20
Total number of patents in this class: 514
10-year publication summary
|
40
|
33
|
29
|
31
|
18
|
9
|
16
|
11
|
7
|
2
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cisco Technology, Inc. | 18858 |
20 |
| Realtek Semiconductor Corp. | 3028 |
19 |
| Marvell Asia PTE, Ltd. | 6841 |
18 |
| Amazon Technologies, Inc. | 24422 |
17 |
| Cavium International | 5549 |
16 |
| Microsoft Technology Licensing, LLC | 51439 |
15 |
| Avago Technologies International Sales Pte. Limited | 9260 |
13 |
| Huawei Technologies Co., Ltd. | 100781 |
12 |
| Samsung Electronics Co., Ltd. | 131630 |
11 |
| Immersion Networks, Inc. | 30 |
9 |
| Cerence Inc. | 326 |
8 |
| Cerence Operating Company | 447 |
8 |
| Yamaha Corporation | 4054 |
7 |
| Dolby Laboratories Licensing Corporation | 3883 |
7 |
| Google LLC | 38759 |
7 |
| MaxLinear, Inc. | 708 |
7 |
| Apple Inc. | 50209 |
6 |
| NEC Corporation | 32703 |
6 |
| Fujitsu Limited | 19265 |
6 |
| ClearOne Inc. | 132 |
6 |
| Other owners | 296 |