- All sections
- H - Electricity
- H04B - Transmission
- H04B 10/291 - Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
Patent holdings for IPC class H04B 10/291
Total number of patents in this class: 464
10-year publication summary
|
23
|
22
|
27
|
32
|
33
|
53
|
54
|
41
|
41
|
9
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Telegraph and Telephone Corporation | 16263 |
80 |
| NEC Corporation | 36472 |
58 |
| Huawei Technologies Co., Ltd. | 119081 |
20 |
| Ntt, Inc. | 2992 |
19 |
| Fujitsu Limited | 17247 |
16 |
| Accelink Technologies Co., Ltd. | 325 |
11 |
| 1FINITY Inc. | 1090 |
9 |
| Neptune Subsea IP Limited | 45 |
8 |
| Ciena Corporation | 2098 |
7 |
| Mitsubishi Electric Corporation | 47461 |
6 |
| Lumeova, Inc. | 28 |
6 |
| Subcom, LLC | 154 |
6 |
| AT&T Intellectual Property I, L.P. | 9815 |
5 |
| The Furukawa Electric Co., Ltd. | 3714 |
5 |
| Google LLC | 43583 |
5 |
| OFS Fitel, LLC | 567 |
5 |
| Cisco Technology, Inc. | 22238 |
4 |
| ZTE Corporation | 43468 |
4 |
| Xieon Networks S.a.r.l. | 163 |
4 |
| Xtera Communications, Inc. | 28 |
4 |
| Other owners | 182 |