- 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 | 1016 |
9 |
| Apple Inc. | 59354 |
3 |
| AT&T Intellectual Property I, L.P. | 10055 |
3 |
| PPC Broadband, Inc. | 1110 |
3 |
| Marvell Asia PTE, Ltd. | 6249 |
3 |
| Murata Manufacturing Co., Ltd. | 25981 |
2 |
| Orange S.A. | 1687 |
2 |
| Samsung Electronics Co., Ltd. | 159298 |
1 |
| Sony Corporation | 30029 |
1 |
| Texas Instruments Incorporated | 19622 |
1 |
| Texas Instruments Japan, Ltd. | 1656 |
1 |
| Media Tek Singapore Pte. Ltd. | 1176 |
1 |
| Oki Electric Industry Co., Ltd. | 1567 |
1 |
| Realtek Semiconductor Corp. | 3525 |
1 |
| Advantest Corporation | 1666 |
1 |
| Novatek Microelectronics Corp. | 1469 |
1 |
| Bongiovi Acoustics LLC. | 76 |
1 |
| Coherent Logix, Incorporated | 46 |
1 |
| Conexant Systems, Inc. | 32 |
1 |
| Deutsche Telekom AG | 1810 |
1 |
| Other owners | 11 |