- 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: 359
10-year publication summary
|
45
|
34
|
40
|
42
|
50
|
31
|
25
|
19
|
15
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cirrus Logic, Inc. | 1771 |
57 |
| Yamaha Corporation | 4094 |
13 |
| Bose Corporation | 2971 |
11 |
| Cirrus Logic International Semiconductor Ltd. | 864 |
11 |
| Qualcomm Incorporated | 84760 |
10 |
| Gracenote, Inc. | 467 |
9 |
| Texas Instruments Incorporated | 19481 |
7 |
| Sonos, Inc. | 2565 |
7 |
| STMicroelectronics S.r.l. | 3621 |
6 |
| NPX B.V. | 2528 |
5 |
| Devialet | 150 |
5 |
| Knowles Electronics, LLC | 600 |
5 |
| Samsung Electronics Co., Ltd. | 144675 |
4 |
| Robert Bosch GmbH | 42596 |
4 |
| Infineon Technologies AG | 8210 |
4 |
| Semiconductor Components Industries, L.L.C. | 5252 |
4 |
| ams International AG | 429 |
4 |
| Avnera Corporation | 115 |
4 |
| Echowell Electronic Co., Ltd. | 12 |
4 |
| Skyworks Solutions, Inc. | 3708 |
4 |
| Other owners | 181 |