- 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: 372
10-year publication summary
|
34
|
40
|
42
|
50
|
31
|
26
|
21
|
18
|
10
|
7
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cirrus Logic, Inc. | 1803 |
57 |
| Yamaha Corporation | 4071 |
13 |
| Bose Corporation | 3093 |
12 |
| Cirrus Logic International Semiconductor Ltd. | 915 |
12 |
| Qualcomm Incorporated | 91997 |
10 |
| Gracenote, Inc. | 505 |
10 |
| Texas Instruments Incorporated | 19663 |
9 |
| Sonos, Inc. | 2853 |
7 |
| STMicroelectronics S.r.l. | 3378 |
6 |
| Samsung Electronics Co., Ltd. | 157557 |
5 |
| NPX B.V. | 2816 |
5 |
| Knowles Electronics, LLC | 593 |
5 |
| Skyworks Solutions, Inc. | 3947 |
5 |
| Robert Bosch GmbH | 44128 |
4 |
| Infineon Technologies AG | 8400 |
4 |
| ams International AG | 446 |
4 |
| Avnera Corporation | 111 |
4 |
| Devialet | 148 |
4 |
| Echowell Electronic Co., Ltd. | 12 |
4 |
| Synaptics Incorporated | 1803 |
4 |
| Other owners | 188 |