- All sections
- H - Electricity
- H04B - Transmission
- H04B 3/21 - Reducing echo effects or singingOpening or closing transmitting pathConditioning for transmission in one direction or the other using a set of bandfilters
Patent holdings for IPC class H04B 3/21
Total number of patents in this class: 49
10-year publication summary
|
0
|
11
|
10
|
2
|
4
|
8
|
3
|
4
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Spotify AB | 1001 |
9 |
| Apple Inc. | 58122 |
3 |
| AT&T Intellectual Property I, L.P. | 9859 |
3 |
| PPC Broadband, Inc. | 1113 |
3 |
| Marvell Asia PTE, Ltd. | 6342 |
3 |
| Murata Manufacturing Co., Ltd. | 25552 |
2 |
| Orange S.A. | 1609 |
2 |
| Samsung Electronics Co., Ltd. | 154120 |
1 |
| Sony Corporation | 30388 |
1 |
| Texas Instruments Incorporated | 19638 |
1 |
| Texas Instruments Japan, Ltd. | 1656 |
1 |
| Media Tek Singapore Pte. Ltd. | 1141 |
1 |
| Oki Electric Industry Co., Ltd. | 1581 |
1 |
| Realtek Semiconductor Corp. | 3432 |
1 |
| Advantest Corporation | 1705 |
1 |
| Novatek Microelectronics Corp. | 1419 |
1 |
| Bongiovi Acoustics LLC. | 76 |
1 |
| Coherent Logix, Incorporated | 47 |
1 |
| Conexant Systems, Inc. | 37 |
1 |
| Deutsche Telekom AG | 1823 |
1 |
| Other owners | 11 |