- 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: 824
10-year publication summary
|
121
|
109
|
96
|
69
|
66
|
55
|
50
|
43
|
48
|
15
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Microsoft Technology Licensing, LLC | 51439 |
61 |
| AT&T Intellectual Property I, L.P. | 9886 |
22 |
| BCE Inc. | 431 |
21 |
| ZTE Corporation | 39218 |
20 |
| AT&T Mobility II LLC | 1982 |
20 |
| Apple Inc. | 50209 |
18 |
| T-Mobile USA, Inc. | 3668 |
18 |
| TapText, LLC | 48 |
17 |
| Verizon Patent And Licensing Inc. | 6900 |
16 |
| Zoom Video Communications, Inc. | 819 |
15 |
| Google LLC | 38759 |
14 |
| Cisco Technology, Inc. | 18858 |
13 |
| Ultratec, Inc. | 78 |
13 |
| Samsung Electronics Co., Ltd. | 131630 |
12 |
| Mitel Networks Corporation | 455 |
12 |
| British Telecommunications Public Limited Company | 2575 |
11 |
| International Business Machines Corporation | 60644 |
10 |
| Movius Interactive Corporation | 48 |
10 |
| Orange | 1759 |
10 |
| Resight, LLC | 12 |
10 |
| Other owners | 481 |