- All sections
- H - Electricity
- H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducersdeaf-aid setspublic 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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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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0
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0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Toshiba Corporation | 12708 |
2 |
| Adaptive Technologies, Inc. | 3 |
1 |
| Max Sound Corporation | 5 |
1 |
| Medical Research Products-b, Inc. | 6 |
1 |
| Toshiba Electronic Devices & Storage Corporation | 2261 |
1 |
| Toshiba Digital Solutions Corporation | 670 |
1 |
| AMP Devices, LLC | 2 |
1 |
| Resideo LLC | 1327 |
1 |
| Tabletalker, Ltd | 4 |
1 |
| Other owners | 0 |