- All sections
- H - Electricity
- H04M - Telephonic communication
- H04M 3/48 - Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy
Patent holdings for IPC class H04M 3/48
Total number of patents in this class: 84
10-year publication summary
|
12
|
14
|
7
|
7
|
1
|
7
|
2
|
2
|
2
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Huawei Technologies Co., Ltd. | 100781 |
6 |
| Microsoft Technology Licensing, LLC | 51439 |
6 |
| RingCentral, Inc. | 731 |
5 |
| Telefonaktiebolaget LM Ericsson (publ) | 26435 |
5 |
| Unify GmbH & Co. KG | 142 |
4 |
| United Services Automobile Association (USAA) | 2514 |
3 |
| Alcatel Lucent | 4720 |
3 |
| British Telecommunications Public Limited Company | 2575 |
2 |
| T-Mobile USA, Inc. | 3668 |
2 |
| Virtualq GmbH | 2 |
2 |
| Alvaria Cayman (cx) | 322 |
2 |
| Arlington Technologies, LLC | 642 |
2 |
| Samsung Electronics Co., Ltd. | 131630 |
1 |
| Qualcomm Incorporated | 76576 |
1 |
| AT&T Intellectual Property II, L.P. | 1075 |
1 |
| AT&T Intellectual Property I, L.P. | 9886 |
1 |
| Nokia Corporation | 6965 |
1 |
| Ericsson | 20417 |
1 |
| Cisco Technology, Inc. | 18858 |
1 |
| Lucent Technologies Inc. | 881 |
1 |
| Other owners | 34 |