- 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
|
0
|
2
|
3
|
2
|
0
|
0
|
1
|
1
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Steelcase Inc. | 1300 |
2 |
| Apple Inc. | 58024 |
1 |
| Honda Motor Co., Ltd. | 25852 |
1 |
| Skype | 133 |
1 |
| Microsoft Technology Licensing, LLC | 54202 |
1 |
| Accenture Global Solutions Limited | 2414 |
1 |
| Dolby Laboratories Licensing Corporation | 4261 |
1 |
| Siemens Schweiz AG | 628 |
1 |
| Unify Patente GmbH & Co. KG | 45 |
1 |
| GenMobi Technologies, Inc. | 5 |
1 |
| Panasonic Automotive Systems Co., Ltd. | 2025 |
1 |
| Other owners | 0 |