- All sections
- C - Chemistrymetallurgy
- C22C - Alloys
- C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
Patent holdings for IPC class C22C 38/18
Total number of patents in this class: 1710
10-year publication summary
|
134
|
185
|
176
|
168
|
149
|
115
|
97
|
75
|
87
|
46
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6852 |
196 |
| Nippon Steel Corporation | 6255 |
156 |
| ArcelorMittal | 2289 |
81 |
| POSCO | 2187 |
80 |
| POSCO Co., Ltd. | 1568 |
63 |
| Baoshan Iron & Steel Co., Ltd. | 963 |
62 |
| True Velocity IP Holdings, Inc. | 247 |
57 |
| ThyssenKrupp Steel Europe AG | 955 |
33 |
| NTN Corporation | 4976 |
25 |
| Hitachi Metals, Ltd. | 1983 |
23 |
| Aperam | 118 |
20 |
| Salzgitter Flachstahl GmbH | 159 |
20 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 167 |
16 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
16 |
| ThyssenKrupp AG | 3287 |
16 |
| NIPPON STEEL Stainless Steel Corporation | 287 |
14 |
| NHK Spring Co., Ltd. | 1862 |
13 |
| Aktiebolaget SKF | 2948 |
12 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
11 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2874 |
11 |
| Other owners | 785 |