- All sections
- H - Electricity
- H03F - Amplifiers
- H03F 3/181 - Low-frequency amplifiers, e.g. audio preamplifiers
Patent holdings for IPC class H03F 3/181
Total number of patents in this class: 354
10-year publication summary
|
45
|
34
|
40
|
42
|
50
|
31
|
25
|
18
|
15
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cirrus Logic, Inc. | 1748 |
57 |
| Yamaha Corporation | 4075 |
13 |
| Bose Corporation | 2921 |
11 |
| Cirrus Logic International Semiconductor Ltd. | 826 |
11 |
| Qualcomm Incorporated | 81865 |
10 |
| Gracenote, Inc. | 443 |
8 |
| Texas Instruments Incorporated | 19432 |
7 |
| Sonos, Inc. | 2462 |
7 |
| STMicroelectronics S.r.l. | 3654 |
6 |
| NPX B.V. | 2372 |
5 |
| Devialet | 143 |
5 |
| Knowles Electronics, LLC | 605 |
5 |
| Samsung Electronics Co., Ltd. | 139001 |
4 |
| Robert Bosch GmbH | 41786 |
4 |
| Infineon Technologies AG | 8137 |
4 |
| Semiconductor Components Industries, L.L.C. | 5246 |
4 |
| ams International AG | 420 |
4 |
| Avnera Corporation | 116 |
4 |
| Echowell Electronic Co., Ltd. | 13 |
4 |
| Skyworks Solutions, Inc. | 3608 |
4 |
| Other owners | 177 |