- 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: 325
10-year publication summary
|
27
|
23
|
22
|
18
|
33
|
27
|
34
|
37
|
32
|
12
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Hitachi High-Tech Corporation | 4424 |
61 |
| Hitachi High-Technologies Corporation | 2034 |
30 |
| ASML Netherlands B.V. | 6816 |
29 |
| FEI Company | 851 |
20 |
| Carl Zeiss Microscopy GmbH | 1146 |
16 |
| Applied Materials, Inc. | 16587 |
15 |
| Applied Materials Israel, Ltd. | 549 |
13 |
| Carl Zeiss MultiSEM GmbH | 85 |
10 |
| ICT Integrated Circuit Testing Gesellschaft für Halbleiterprüftechnik mbH | 149 |
9 |
| JEOL Ltd. | 556 |
9 |
| NuFlare Technology, Inc. | 770 |
8 |
| KLA Corporation | 1223 |
8 |
| Hitachi High-Tech Science Corporation | 326 |
5 |
| Carl Zeiss SMT GmbH | 2646 |
4 |
| KLA-Tencor Corporation | 2574 |
4 |
| Hermes Microvision Incorporated B.V. | 129 |
4 |
| TASMIT, Inc. | 52 |
4 |
| Samsung Electronics Co., Ltd. | 131630 |
3 |
| Hitachi, Ltd. | 16452 |
3 |
| Ebara Corporation | 1951 |
3 |
| Other owners | 67 |