- 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 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
Patent holdings for IPC class C21D 9/00
Total number of patents in this class: 2197
10-year publication summary
212
|
248
|
232
|
175
|
179
|
191
|
172
|
194
|
177
|
44
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Nippon Steel Corporation | 5649 |
205 |
JFE Steel Corporation | 6067 |
139 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
71 |
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
51 |
Hitachi Metals, Ltd. | 2175 |
32 |
ArcelorMittal | 1887 |
31 |
Schwartz GmbH | 58 |
28 |
Baoshan Iron & Steel Co., Ltd. | 832 |
24 |
Caterpillar Inc. | 8877 |
23 |
POSCO Co., Ltd. | 1059 |
21 |
Robert Bosch GmbH | 40953 |
19 |
NTN Corporation | 5008 |
19 |
Neturen Co., Ltd. | 193 |
18 |
Proterial, Ltd. | 638 |
17 |
Ebner Industrieofenbau GmbH | 132 |
16 |
ThyssenKrupp Steel Europe AG | 924 |
14 |
NHK Spring Co., Ltd. | 1657 |
13 |
GE Infrastructure Technology, LLC | 5873 |
13 |
Honda Motor Co., Ltd. | 24537 |
12 |
Komatsu Ltd. | 4265 |
12 |
Other owners | 1419 |