- All sections
- H - Electricity
- H01J - Electric discharge tubes or discharge lamps
- H01J 37/21 - Means for adjusting the focus
Patent holdings for IPC class H01J 37/21
Total number of patents in this class: 343
10-year publication summary
|
23
|
22
|
18
|
33
|
27
|
34
|
37
|
33
|
30
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Hitachi High-Tech Corporation | 5065 |
63 |
| ASML Netherlands B.V. | 7179 |
31 |
| Hitachi High-Technologies Corporation | 2018 |
30 |
| FEI Company | 896 |
21 |
| Carl Zeiss Microscopy GmbH | 1175 |
18 |
| Applied Materials, Inc. | 17779 |
15 |
| Applied Materials Israel, Ltd. | 578 |
14 |
| Carl Zeiss MultiSEM GmbH | 113 |
12 |
| NuFlare Technology, Inc. | 809 |
11 |
| ICT Integrated Circuit Testing Gesellschaft für Halbleiterprüftechnik mbH | 153 |
10 |
| JEOL Ltd. | 562 |
10 |
| KLA Corporation | 1404 |
9 |
| Hitachi High-Tech Science Corporation | 323 |
5 |
| Carl Zeiss SMT GmbH | 2819 |
5 |
| KLA-Tencor Corporation | 2550 |
4 |
| Hermes Microvision Incorporated B.V. | 124 |
4 |
| TASMIT, Inc. | 60 |
4 |
| Samsung Electronics Co., Ltd. | 139302 |
3 |
| Hitachi, Ltd. | 15239 |
3 |
| Ebara Corporation | 2083 |
3 |
| Other owners | 68 |