- All sections
- C - Chemistrymetallurgy
- C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
- C21D 1/40 - Direct resistance heating
Patent holdings for IPC class C21D 1/40
Total number of patents in this class: 161
10-year publication summary
|
20
|
15
|
12
|
11
|
5
|
6
|
3
|
10
|
5
|
8
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Neturen Co., Ltd. | 198 |
19 |
| NHK Spring Co., Ltd. | 1983 |
17 |
| Chuo Hatsujo Kabushiki Kaisha | 127 |
8 |
| California Institute of Technology | 4043 |
5 |
| Sumitomo Heavy Industries, Ltd. | 2110 |
5 |
| Apple Inc. | 58705 |
4 |
| Asteer Co., Ltd. | 10 |
4 |
| NTN Corporation | 4915 |
3 |
| Gottfried Wilhelm Leibniz Universität Hannover | 154 |
3 |
| Institute for Basic Science | 384 |
3 |
| Nippon Steel Corporation | 6843 |
3 |
| Tokyo Rope Mfg. Co., Ltd. | 66 |
3 |
| TOYOTA JIDOSHA KABUSHIKI KAISHA (also trading as TOYOTA MOTOR CORPORATION) | 12387 |
3 |
| GM Global Technology Operations LLC | 16106 |
2 |
| Hyundai Motor Company | 24602 |
2 |
| The United States of America as represented by the Secretary of the Navy | 2856 |
2 |
| Sumitomo Wiring Systems, Ltd. | 10987 |
2 |
| Northwestern University | 3540 |
2 |
| Benteler Automobiltechnik GmbH | 305 |
2 |
| JFE Steel Corporation | 7508 |
2 |
| Other owners | 67 |