- 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: 370
10-year publication summary
|
34
|
39
|
41
|
50
|
31
|
26
|
20
|
16
|
10
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cirrus Logic, Inc. | 1792 |
57 |
| Yamaha Corporation | 4067 |
13 |
| Bose Corporation | 3077 |
12 |
| Cirrus Logic International Semiconductor Ltd. | 922 |
12 |
| Qualcomm Incorporated | 90109 |
10 |
| Gracenote, Inc. | 496 |
9 |
| Texas Instruments Incorporated | 19615 |
8 |
| Sonos, Inc. | 2787 |
7 |
| STMicroelectronics S.r.l. | 3407 |
6 |
| Samsung Electronics Co., Ltd. | 153573 |
5 |
| NPX B.V. | 2729 |
5 |
| Knowles Electronics, LLC | 589 |
5 |
| Skyworks Solutions, Inc. | 3884 |
5 |
| Robert Bosch GmbH | 43554 |
4 |
| Infineon Technologies AG | 8383 |
4 |
| Semiconductor Components Industries, L.L.C. | 5262 |
4 |
| ams International AG | 443 |
4 |
| Avnera Corporation | 111 |
4 |
| Devialet | 148 |
4 |
| Echowell Electronic Co., Ltd. | 12 |
4 |
| Other owners | 188 |