- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/40 - Applications of speech amplifiers
Patent holdings for IPC class H04M 3/40
Total number of patents in this class: 12
10-year publication summary
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0
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0
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0
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2
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3
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2
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0
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0
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0
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1
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Steelcase Inc. | 1361 |
2 |
| Honda Motor Co., Ltd. | 24537 |
1 |
| Lucent Technologies Inc. | 881 |
1 |
| Skype | 136 |
1 |
| Microsoft Technology Licensing, LLC | 51439 |
1 |
| Accenture Global Solutions Limited | 2132 |
1 |
| Dolby Laboratories Licensing Corporation | 3883 |
1 |
| Siemens Schweiz AG | 580 |
1 |
| Unify Patente GmbH & Co. KG | 301 |
1 |
| GenMobi Technologies, Inc. | 5 |
1 |
| Panasonic Automotive Systems Co., Ltd. | 1440 |
1 |
| Other owners | 0 |