- All sections
- G - Physics
- G01N - Investigating or analysing materials by determining their chemical or physical properties
- G01N 3/40 - Investigating hardness or rebound hardness
Patent holdings for IPC class G01N 3/40
Total number of patents in this class: 329
10-year publication summary
|
22
|
26
|
30
|
32
|
20
|
22
|
25
|
17
|
12
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Maxell, Ltd. | 2752 |
7 |
| Halliburton Energy Services, Inc. | 20697 |
6 |
| Centre National de La Recherche Scientifique | 10284 |
5 |
| Maxell Holdings, Ltd. | 1330 |
5 |
| Erweka GmbH | 22 |
4 |
| Hysitron, Inc. | 35 |
4 |
| JFE Steel Corporation | 6730 |
4 |
| Gregg Drilling, LLC | 11 |
4 |
| Schlumberger Canada Limited | 7211 |
3 |
| Honeywell International Inc. | 13583 |
3 |
| Ecole Nationale Superieure de Mecanique et des Microtechniques | 27 |
3 |
| Her Majesty The Queen in Right of Canada AS represented by The Minister of Natural Resources Canada | 51 |
3 |
| Hiroshima University | 556 |
3 |
| Iml-instrumenta Mechanik Labor GmbH | 38 |
3 |
| MARL Technologies Inc. | 12 |
3 |
| Universite de Franche-comte | 188 |
3 |
| Samsung Electronics Co., Ltd. | 143555 |
2 |
| Schlumberger Technology Corporation | 10597 |
2 |
| The Regents of the University of California | 19784 |
2 |
| The Boeing Company | 19980 |
2 |
| Other owners | 258 |