- All sections
- H - Electricity
- H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; deaf-aid sets; public address systems
- H04R 3/04 - Circuits for transducers for correcting frequency response
Patent holdings for IPC class H04R 3/04
Total number of patents in this class: 3083
10-year publication summary
|
166
|
256
|
362
|
369
|
389
|
464
|
366
|
309
|
321
|
93
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sonos, Inc. | 2274 |
156 |
| Samsung Electronics Co., Ltd. | 131630 |
118 |
| Cirrus Logic, Inc. | 1719 |
96 |
| Dolby Laboratories Licensing Corporation | 3883 |
89 |
| Apple Inc. | 50209 |
83 |
| Bose Corporation | 2880 |
74 |
| Yamaha Corporation | 4054 |
71 |
| Harman International Industries, Incorporated | 2443 |
60 |
| Sony Corporation | 32931 |
56 |
| Google LLC | 38759 |
49 |
| META Platforms Technologies, LLC | 4806 |
35 |
| Huawei Technologies Co., Ltd. | 100781 |
31 |
| Microsoft Technology Licensing, LLC | 51439 |
31 |
| Panasonic Intellectual Property Management Co., Ltd. | 27812 |
29 |
| Qualcomm Incorporated | 76576 |
28 |
| JVC Kenwood Corporation | 2774 |
27 |
| Knowles Electronics, LLC | 597 |
27 |
| Nokia Technologies Oy | 15057 |
26 |
| Magic Leap, Inc. | 3028 |
26 |
| Boomcloud 360 Inc. | 69 |
25 |
| Other owners | 1946 |