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The patent EP3473798 was granted to Nippon Steel on Jun 18, 2025. The application was filed on Oct 20, 2017 under application number EP17306444A. The patent is currently recorded with a legal status of "Patent Maintained As Amended".

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 |
|---|---|---|---|
| HYDRIL | Dec 11, 2020 | BOULT WADE TENNANT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2011278838 |
| DESCRIPTION | US7661728 |
| DESCRIPTION | USRE30647E |
| DESCRIPTION | USRE34467E |
| OPPOSITION | DE4345119 |
| OPPOSITION | US2006145477 |
| OPPOSITION | US2006145480 |
| OPPOSITION | US2006261595 |
| OPPOSITION | US2008054633 |
| OPPOSITION | US2011278838 |
| OPPOSITION | US2014203556 |
| OPPOSITION | US2016186899 |
| OPPOSITION | US2016208962 |
| OPPOSITION | US5338074 |
| OPPOSITION | US6158785 |
| OPPOSITION | US6206436 |
| OPPOSITION | US7475917 |
| OPPOSITION | US7828337 |
| OPPOSITION | US7850211 |
| OPPOSITION | WO2007149673 |
| OPPOSITION | WO2008116891 |
| OPPOSITION | WO2011060894 |
| OPPOSITION | WO2017024208 |
| SEARCH | US2011278838 |
| SEARCH | US2016186899 |
| SEARCH | US2016208962 |
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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May 22, 2025
May 22, 2025
May 6, 2025
May 6, 2025
Description
OPPO
May 6, 2025
May 6, 2025
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Refund of fees
Appeal
Mar 3, 2025
Feb 26, 2025
(Electronic) Receipt
Appeal
Feb 26, 2025
Feb 26, 2025
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Withdrawal of an appeal
Appeal
Feb 25, 2025
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Appeal
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Appeal
Mar 1, 2024
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Oct 12, 2023
(Electronic) Receipt
Appeal
Oct 12, 2023
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Reply to appeal
Appeal
Jun 2, 2023
May 26, 2023
(Electronic) Receipt
Appeal
May 26, 2023
(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Mar 27, 2023
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Notice of appeal
Appeal
Jan 17, 2023
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OPPO
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OPPO
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Document concerning representation
Search/Exam
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Mar 23, 2020
Feb 13, 2020
Decision to grant a European patent
Search/Exam
Jan 30, 2020
(Electronic) Receipt
Search/Exam
Jan 30, 2020
Filing of the translations of the claims
Search/Exam
Jan 30, 2020
French translation of claims
Search/Exam
Jan 30, 2020
German translation of the claims
Search/Exam
Jan 30, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 9, 2020
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Intention to grant (signatures)
Search/Exam
Jan 9, 2020
Text intended for grant (clean copy)
Search/Exam
Jan 9, 2020
Nov 14, 2019
Examination started
Search/Exam
Aug 28, 2019
(Electronic) Receipt
Search/Exam
Aug 28, 2019
Letter accompanying subsequently filed items
Search/Exam
Aug 28, 2019
Reply to Written Opinion prepared by the EPO
Search/Exam
Aug 26, 2019
(Electronic) Receipt
Search/Exam
Aug 26, 2019
Letter accompanying subsequently filed items
Search/Exam
May 17, 2019
Apr 29, 2019
Mar 27, 2019
Notification of forthcoming publication
Search/Exam
Aug 27, 2018
Communication to designated inventor
Search/Exam
Aug 27, 2018
Communication to designated inventor
Search/Exam
Aug 20, 2018
(Electronic) Receipt
Search/Exam
Aug 20, 2018
Designation of inventor
Search/Exam
Aug 20, 2018
Letter accompanying subsequently filed items
Search/Exam
Apr 11, 2018
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European search opinion
Search/Exam
Apr 11, 2018
European search report
Search/Exam
Apr 11, 2018
Information on Search Strategy
Search/Exam
Mar 27, 2018
Search started
Search/Exam
Nov 24, 2017
Deficiency in designation of inventor
Search/Exam
Nov 2, 2017
Oct 20, 2017
Abstract
Search/Exam
Oct 20, 2017
Oct 20, 2017
Claims
Search/Exam
Oct 20, 2017
Description
Search/Exam
Oct 20, 2017
Drawings
Search/Exam
Oct 20, 2017
Request for grant of a European patent
Search/Exam