- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/533 - Voice mail systems
Patent holdings for IPC class H04M 3/533
Total number of patents in this class: 813
10-year publication summary
|
109
|
96
|
69
|
66
|
55
|
50
|
43
|
49
|
38
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Microsoft Technology Licensing, LLC | 52886 |
63 |
| Apple Inc. | 52750 |
21 |
| ZTE Corporation | 41061 |
21 |
| AT&T Intellectual Property I, L.P. | 9337 |
20 |
| TapText, LLC | 61 |
20 |
| AT&T Mobility II LLC | 1838 |
19 |
| T-Mobile USA, Inc. | 3903 |
18 |
| Verizon Patent And Licensing Inc. | 6947 |
15 |
| BCE Inc. | 413 |
15 |
| Ultratec, Inc. | 81 |
15 |
| Google LLC | 40853 |
14 |
| Cisco Technology, Inc. | 19347 |
13 |
| Samsung Electronics Co., Ltd. | 139001 |
12 |
| British Telecommunications Public Limited Company | 2603 |
11 |
| Value-Added Communications, Inc. | 20 |
11 |
| 8x8, Inc. | 426 |
10 |
| Movius Interactive Corporation | 53 |
10 |
| Orange | 1853 |
10 |
| Resight, LLC | 12 |
10 |
| Research In Motion Limited | 2165 |
9 |
| Other owners | 476 |