- 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: 371
10-year publication summary
|
34
|
40
|
42
|
50
|
31
|
26
|
21
|
18
|
11
|
7
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cirrus Logic, Inc. | 1799 |
56 |
| Yamaha Corporation | 4094 |
13 |
| Bose Corporation | 3108 |
12 |
| Cirrus Logic International Semiconductor Ltd. | 938 |
12 |
| Qualcomm Incorporated | 93847 |
10 |
| Gracenote, Inc. | 515 |
10 |
| Texas Instruments Incorporated | 19638 |
9 |
| Sonos, Inc. | 2896 |
7 |
| STMicroelectronics S.r.l. | 3363 |
6 |
| Samsung Electronics Co., Ltd. | 159473 |
5 |
| NPX B.V. | 2855 |
5 |
| Knowles Electronics, LLC | 595 |
5 |
| Skyworks Solutions, Inc. | 3996 |
5 |
| Robert Bosch GmbH | 44398 |
4 |
| Infineon Technologies AG | 8427 |
4 |
| Avnera Corporation | 111 |
4 |
| Devialet | 144 |
4 |
| Echowell Electronic Co., Ltd. | 12 |
4 |
| Synaptics Incorporated | 1843 |
4 |
| Biamp Systems, LLC | 358 |
4 |
| Other owners | 188 |