- All sections
- H - Electricity
- H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; deaf-aid sets; public address systems
- H04R 21/00 - Variable-resistance transducers
Patent holdings for IPC class H04R 21/00
Total number of patents in this class: 10
10-year publication summary
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0
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0
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0
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0
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1
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0
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0
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1
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0
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0
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Toshiba Corporation | 12017 |
2 |
| Adaptive Technologies, Inc. | 4 |
1 |
| Ideaworkx LLC | 6 |
1 |
| Max Sound Corporation | 5 |
1 |
| Medical Research Products-b, Inc. | 11 |
1 |
| Toshiba Electronic Devices & Storage Corporation | 1602 |
1 |
| Toshiba Digital Solutions Corporation | 641 |
1 |
| Ademco Inc. | 1374 |
1 |
| AMP Devices, LLC | 2 |
1 |
| Other owners | 0 |