- All sections
- H - Electricity
- H03H - Impedance networks, e.g. resonant circuitsresonators
- H03H 9/21 - Crystal tuning forks
Patent holdings for IPC class H03H 9/21
Total number of patents in this class: 131
10-year publication summary
|
13
|
10
|
9
|
6
|
5
|
5
|
4
|
5
|
2
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Seiko Epson Corporation | 19734 |
37 |
| Murata Manufacturing Co., Ltd. | 25107 |
20 |
| SII Crystal Technology Inc. | 21 |
15 |
| Daishinku Corporation | 246 |
10 |
| Seiko Instruments Inc. | 476 |
5 |
| SiTime Corporation | 213 |
5 |
| Kyocera Corporation | 14108 |
4 |
| Schlumberger Technology Corporation | 11129 |
3 |
| ETA SA Manufacture Horlogere Suisse | 681 |
3 |
| CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Developpement | 230 |
2 |
| Nihon Dempa Kogyo Co., Ltd. | 259 |
2 |
| Statek Corporation | 17 |
2 |
| The Swatch Group Research and Development Ltd | 863 |
2 |
| Sony Corporation | 30735 |
1 |
| Centre National de La Recherche Scientifique | 10726 |
1 |
| Fujitsu Limited | 17637 |
1 |
| Robert Bosch GmbH | 43097 |
1 |
| Denso Corporation | 24863 |
1 |
| The Board of Trustees of the Leland Stanford Junior University | 6552 |
1 |
| Boe Technology Group Co., Ltd. | 42050 |
1 |
| Other owners | 14 |