- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making 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: 139
10-year publication summary
19
|
12
|
20
|
14
|
12
|
11
|
5
|
6
|
2
|
3
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Neturen Co., Ltd. | 193 |
19 |
Chuo Hatsujo Kabushiki Kaisha | 124 |
8 |
NHK Spring Co., Ltd. | 1657 |
7 |
California Institute of Technology | 3884 |
5 |
Apple Inc. | 50209 |
4 |
Asteer Co., Ltd. | 11 |
4 |
NTN Corporation | 5008 |
3 |
Gottfried Wilhelm Leibniz Universität Hannover | 148 |
3 |
Nippon Steel Corporation | 5649 |
3 |
Radyne Corporation | 39 |
3 |
Sumitomo Heavy Industries, Ltd. | 1670 |
3 |
TOYOTA JIDOSHA KABUSHIKI KAISHA (also trading as TOYOTA MOTOR CORPORATION) | 13301 |
3 |
Toyota Motor Corporation | 28582 |
2 |
GM Global Technology Operations LLC | 13620 |
2 |
Hyundai Motor Company | 19021 |
2 |
The United States of America as represented by the Secretary of the Navy | 2734 |
2 |
Sumitomo Wiring Systems, Ltd. | 9367 |
2 |
Northwestern University | 3112 |
2 |
Benteler Automobiltechnik GmbH | 258 |
2 |
Institute for Basic Science | 316 |
2 |
Other owners | 58 |