- All sections
- H - Electricity
- H04B - Transmission
- H04B 3/23 - Reducing echo effects or singingOpening or closing transmitting pathConditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
Patent holdings for IPC class H04B 3/23
Total number of patents in this class: 447
10-year publication summary
|
35
|
42
|
45
|
24
|
25
|
20
|
18
|
17
|
17
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Realtek Semiconductor Corp. | 3525 |
20 |
| Marvell Asia PTE, Ltd. | 6249 |
18 |
| Cisco Technology, Inc. | 22638 |
17 |
| Huawei Technologies Co., Ltd. | 125107 |
16 |
| NEC Corporation | 37491 |
13 |
| Yamaha Corporation | 4089 |
13 |
| Amazon Technologies, Inc. | 28299 |
11 |
| Cavium International | 4555 |
11 |
| Apple Inc. | 59354 |
10 |
| Qualcomm Incorporated | 93712 |
10 |
| Mitsubishi Electric Corporation | 48409 |
10 |
| ARRIS Enterprises LLC | 3394 |
10 |
| Infineon Technologies Americas Corp. | 1935 |
10 |
| Imagination Technologies Limited | 1797 |
9 |
| Mitel Networks Corporation | 62 |
8 |
| Panasonic Corporation | 18658 |
7 |
| Intel Corporation | 46313 |
7 |
| Avago Technologies International Sales Pte. Limited | 8525 |
7 |
| Microsoft Technology Licensing, LLC | 54661 |
6 |
| Dolby Laboratories Licensing Corporation | 4384 |
6 |
| Other owners | 228 |