Patent holdings for IPC class C21D 8/10

Total number of patents in this class: 835

10-year publication summary

57
81
75
44
61
55
54
58
56
20
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026

Principal owners for this class

Owner
All patents
This class
JFE Steel Corporation
7339
227
Nippon Steel Corporation
6687
213
Nippon Steel & Sumitomo Metal Corporation
1985
44
Baoshan Iron & Steel Co., Ltd.
1072
42
Sumitomo Metal Industries, Ltd.
329
21
Salzgitter Flachstahl GmbH
161
11
Tenaris Coiled Tubes, LLC
23
10
POSCO Co., Ltd.
1656
9
Tenaris Connections B.V.
189
9
DALMINE S.p.A.
22
6
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
2839
6
Sandvik Intellectual Property AB
1418
6
American Axle & Manufacturing, Inc.
646
5
Sandvik Materials Technology Deutschland GmbH
59
5
Vallourec Deutschland GmbH
34
5
NIPPON STEEL Stainless Steel Corporation
277
5
LG Electronics Inc.
74953
4
NHK Spring Co., Ltd.
1935
4
Physical Systems, Inc.
37
4
Usui Co., Ltd.
122
4
Other owners 195