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The patent EP3741874 was granted to Arcelormittal on Oct 11, 2023. The application was filed on Oct 20, 2015 under application number EP20184543A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| VOESTALPINE STAHL | Jul 11, 2024 | AERA | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | JP2008127612 |
| DESCRIPTION | JP2013001837 |
| DESCRIPTION | WO2006068399 |
| OPPOSITION | EP0019849 |
| OPPOSITION | EP0866144 |
| OPPOSITION | JP2000129409 |
| OPPOSITION | JP2008127600 |
| OPPOSITION | US5009726 |
| OPPOSITION | US5116436 |
| OPPOSITION | WO2006068399 |
| SEARCH | EP2602335 |
| SEARCH | JP2008127612 |
| SEARCH | WO0065103 |
| SEARCH | WO2006068399 |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
Date
Description
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Nov 18, 2025
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Communication of amended entries
Search/Exam
Nov 4, 2025
Communication of amended entries
Search/Exam
Oct 28, 2025
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Authorisation
OPPO
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Oct 24, 2023
Sep 14, 2023
Decision to grant a European patent
Search/Exam
Aug 30, 2023
(Electronic) Receipt
Search/Exam
Aug 30, 2023
Filing of the translations of the claims
Search/Exam
Aug 30, 2023
French translation of claims
Search/Exam
Aug 30, 2023
German translation of the claims
Search/Exam
Aug 30, 2023
Letter accompanying subsequently filed items
Search/Exam
May 3, 2023
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Intention to grant (signatures)
Search/Exam
May 3, 2023
Text intended for grant (clean copy)
Search/Exam
May 3, 2023
Mar 28, 2023
(Electronic) Receipt
Search/Exam
Mar 28, 2023
Amended description with annotations
Search/Exam
Mar 28, 2023
Description
Search/Exam
Mar 28, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 28, 2023
Feb 24, 2023
Feb 24, 2023
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Feb 24, 2023
Intention to grant (signatures)
Search/Exam
Feb 24, 2023
Text intended for grant (clean copy)
Search/Exam
Feb 24, 2023
Mar 21, 2022
(Electronic) Receipt
Search/Exam
Mar 21, 2022
Amended description with annotations
Search/Exam
Mar 21, 2022
Description
Search/Exam
Mar 21, 2022
Letter accompanying subsequently filed items
Search/Exam
Mar 21, 2022
Jan 18, 2022
Jan 13, 2022
(Electronic) Receipt
Search/Exam
Jan 13, 2022
Letter accompanying subsequently filed items
Search/Exam
Jan 13, 2022
Sep 15, 2021
Annex to the communication
Search/Exam
Sep 15, 2021
Communication from the Examining Division
Search/Exam
Sep 10, 2021
Examination started
Search/Exam
May 20, 2021
(Electronic) Receipt
Search/Exam
May 20, 2021
Letter accompanying subsequently filed items
Search/Exam
May 20, 2021
Reply to Written Opinion prepared by the EPO
Search/Exam
Dec 14, 2020
Communication to designated inventor
Search/Exam
Dec 7, 2020
(Electronic) Receipt
Search/Exam
Dec 7, 2020
Letter accompanying subsequently filed items
Search/Exam
Dec 7, 2020
Letter concerning the inventor
Search/Exam
Nov 30, 2020
Nov 4, 2020
Refund of fees
Search/Exam
Oct 28, 2020
Notification of forthcoming publication
Search/Exam
Oct 13, 2020
Oct 13, 2020
European search opinion
Search/Exam
Oct 13, 2020
European search report
Search/Exam
Oct 13, 2020
Information on Search Strategy
Search/Exam
Oct 1, 2020
Sep 17, 2020
Letter which had not been notified
Search/Exam
Sep 1, 2020
Search started
Search/Exam
Aug 28, 2020
Communication to designated inventor
Search/Exam
Aug 28, 2020
Communication to designated inventor
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Aug 28, 2020
Communication to designated inventor
Search/Exam
Aug 28, 2020
Communication to designated inventor
Search/Exam
Jul 14, 2020
Priority search results copy provided by EPO
Search/Exam
Jul 7, 2020
Abstract
Search/Exam
Jul 7, 2020
Jul 7, 2020
Claims
Search/Exam
Jul 7, 2020
Description
Search/Exam
Jul 7, 2020
Designation of inventor
Search/Exam
Jul 7, 2020
Request for grant of a European patent
Search/Exam
May 20, 2017
Priority search results copy provided by EPO
Search/Exam
May 18, 2016