- All sections
- H - Electricity
- H03H - Impedance networks, e.g. resonant circuits; resonators
- H03H 9/21 - Crystal tuning forks
Patent holdings for IPC class H03H 9/21
Total number of patents in this class: 139
10-year publication summary
19
|
22
|
13
|
10
|
9
|
6
|
5
|
6
|
4
|
1
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Seiko Epson Corporation | 18724 |
45 |
Murata Manufacturing Co., Ltd. | 22355 |
19 |
SII Crystal Technology Inc. | 21 |
15 |
Daishinku Corporation | 220 |
10 |
Seiko Instruments Inc. | 660 |
6 |
Kyocera Corporation | 12735 |
4 |
SiTime Corporation | 181 |
4 |
ETA SA Manufacture Horlogere Suisse | 638 |
3 |
Schlumberger Technology Corporation | 9690 |
2 |
Sony Corporation | 32931 |
2 |
Robert Bosch GmbH | 40953 |
2 |
CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Developpement | 228 |
2 |
Nihon Dempa Kogyo Co., Ltd. | 265 |
2 |
Statek Corporation | 13 |
2 |
The Swatch Group Research and Development Ltd | 778 |
2 |
Centre National de La Recherche Scientifique | 9632 |
1 |
Fujitsu Limited | 19265 |
1 |
Denso Corporation | 23338 |
1 |
The Board of Trustees of the Leland Stanford Junior University | 6054 |
1 |
Boe Technology Group Co., Ltd. | 35384 |
1 |
Other owners | 14 |