- 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: 52
10-year publication summary
|
1
|
0
|
11
|
10
|
2
|
4
|
8
|
3
|
4
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Immersion Networks, Inc. | 30 |
9 |
| Apple Inc. | 54479 |
3 |
| AT&T Intellectual Property I, L.P. | 9470 |
3 |
| PPC Broadband, Inc. | 1044 |
3 |
| Marvell Asia PTE, Ltd. | 6555 |
3 |
| Murata Manufacturing Co., Ltd. | 24342 |
2 |
| Orange S.A. | 1538 |
2 |
| Samsung Electronics Co., Ltd. | 144143 |
1 |
| Sony Corporation | 31148 |
1 |
| Texas Instruments Incorporated | 19487 |
1 |
| Texas Instruments Japan, Ltd. | 1656 |
1 |
| Media Tek Singapore Pte. Ltd. | 1064 |
1 |
| Oki Electric Industry Co., Ltd. | 1595 |
1 |
| Realtek Semiconductor Corp. | 3271 |
1 |
| Advantest Corporation | 1831 |
1 |
| Novatek Microelectronics Corp. | 1302 |
1 |
| Bongiovi Acoustics LLC. | 75 |
1 |
| Coherent Logix, Incorporated | 182 |
1 |
| Conexant Systems, Inc. | 55 |
1 |
| Deutsche Telekom AG | 1834 |
1 |
| Other owners | 14 |