- All sections
- H - Electricity
- H03H - Impedance networks, e.g. resonant circuits; resonators
- H03H 9/215 - Crystal tuning forks consisting of quartz
Patent holdings for IPC class H03H 9/215
Total number of patents in this class: 155
10-year publication summary
|
19
|
15
|
6
|
8
|
16
|
7
|
4
|
12
|
13
|
9
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Seiko Epson Corporation | 18724 |
59 |
| Murata Manufacturing Co., Ltd. | 22355 |
18 |
| Daishinku Corporation | 220 |
16 |
| Seiko Instruments Inc. | 660 |
13 |
| Statek Corporation | 13 |
8 |
| citizen Watch Co., Ltd. | 1062 |
4 |
| Piedek Technical Laboratory | 6 |
4 |
| SII Crystal Technology Inc. | 21 |
4 |
| citizen Holdings Co., Ltd. | 332 |
3 |
| ETA SA Manufacture Horlogere Suisse | 638 |
3 |
| Office National d'Etudes et de Recherches Aerospatiales (onera) | 155 |
3 |
| HRL Laboratories, LLC | 1588 |
2 |
| Micro Crystal AG | 10 |
2 |
| Qorvo US, Inc. | 2018 |
2 |
| Tianjin University | 695 |
2 |
| Schlumberger Technology Corporation | 9690 |
1 |
| Huawei Technologies Co., Ltd. | 100781 |
1 |
| Kyocera Corporation | 12735 |
1 |
| Ebara Corporation | 1951 |
1 |
| Global Dental Science LLC | 40 |
1 |
| Other owners | 7 |