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The patent EP3992418 was granted to Nippon Steel on Aug 2, 2023. The application was filed on Oct 28, 2020 under application number EP20204267A. 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 |
|---|---|---|---|
| HYDRIL | May 2, 2024 | 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 | US7661728 |
| OPPOSITION | DE4345119 |
| OPPOSITION | EP1310719 |
| OPPOSITION | EP3078893 |
| OPPOSITION | EP3473798 |
| OPPOSITION | EP3514431 |
| OPPOSITION | EP3514432 |
| OPPOSITION | EP3854987 |
| OPPOSITION | US2007132239 |
| OPPOSITION | US2010283239 |
| OPPOSITION | US2011278838 |
| OPPOSITION | US2015240570 |
| OPPOSITION | US2020102797 |
| OPPOSITION | US6206436 |
| OPPOSITION | US6412831 |
| OPPOSITION | US6481760 |
| OPPOSITION | US6933264 |
| OPPOSITION | US6976711 |
| OPPOSITION | WO2007149673 |
| OPPOSITION | WO2014044773 |
| OPPOSITION | WO2014187873 |
| OPPOSITION | WO2015086466 |
| OPPOSITION | WO2016108141 |
| OPPOSITION | WO2019224344 |
| SEARCH | US2016186899 |
| SEARCH | WO2014187873 |
| SEARCH | WO2016108141 |
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.
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Decision to grant a European patent
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(Electronic) Receipt
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(Electronic) Receipt
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Jun 12, 2023
Annex
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Filing of the translations of the claims
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Jun 12, 2023
French translation of claims
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Jun 12, 2023
German translation of the claims
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Jun 12, 2023
Letter accompanying subsequently filed items
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Jun 12, 2023
Request for unitary effect
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Intention to grant (signatures)
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Apr 11, 2023
Text intended for grant (clean copy)
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Apr 11, 2023
Mar 6, 2023
Examination started
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Oct 17, 2022
(Electronic) Receipt
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Oct 17, 2022
Letter accompanying subsequently filed items
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Oct 17, 2022
Letter concerning fees and payments
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May 10, 2022
Apr 6, 2022
Notification of forthcoming publication
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Sep 30, 2021
(Electronic) Receipt
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Sep 30, 2021
Designation of inventor
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Sep 30, 2021
Letter accompanying subsequently filed items
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Sep 30, 2021
Letter concerning the inventor
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Mar 11, 2021
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European search opinion
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Mar 11, 2021
European search report
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Mar 11, 2021
Information on Search Strategy
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Mar 4, 2021
Modified abstract
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Feb 25, 2021
Search started
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Jan 13, 2021
(Electronic) Receipt
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Jan 13, 2021
Drawings
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Letter accompanying subsequently filed items
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Dec 6, 2020
(Electronic) Receipt
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Dec 6, 2020
Letter accompanying subsequently filed items
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Dec 6, 2020
Matter concerning the application
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Nov 16, 2020
Nov 16, 2020
Deficiency in designation of inventor
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Oct 28, 2020
Abstract
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Oct 28, 2020
Oct 28, 2020
Claims
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Oct 28, 2020
Description
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Oct 28, 2020
Drawings
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Oct 28, 2020
Request for grant of a European patent
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