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The patent EP3234298 was granted to Nippon Steel on May 1, 2019. The application was filed on Dec 16, 2015 under application number EP15810657A. The patent is currently recorded with a legal status of "Revoked".

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 | Jan 31, 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 |
|---|---|
| INTERNATIONAL-SEARCH-REPORT | FR2939861 |
| INTERNATIONAL-SEARCH-REPORT | US6543816 |
| INTERNATIONAL-SEARCH-REPORT | WO2011060894 |
| OPPOSITION | US2002027363 |
| OPPOSITION | US2006145480 |
| OPPOSITION | US5415442 |
| OPPOSITION | US6543816 |
| OPPOSITION | WO0206715 |
| OPPOSITION | WO0235128 |
| OPPOSITION | WO2004109173 |
| OPPOSITION | WO2011060894 |
| OPPOSITION | WO2012025461 |
| OPPOSITION | WO2014044773 |
| OPPOSITION | WO2014187873 |
| OPPOSITION | WO9947785 |
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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Jan 21, 2025
Jan 21, 2025
Jan 21, 2025
Nov 15, 2024
Nov 15, 2024
Nov 15, 2024
Nov 8, 2024
Nov 7, 2024
(Electronic) Receipt
Appeal
Nov 7, 2024
Nov 7, 2024
Oct 14, 2024
Refund of fees
Appeal
Oct 8, 2024
Oct 7, 2024
(Electronic) Receipt
Appeal
Oct 7, 2024
Oct 7, 2024
Withdrawal of an appeal
Appeal
Sep 18, 2024
Sep 18, 2024
Sep 18, 2024
Sep 18, 2024
Sep 12, 2024
(Electronic) Receipt
Appeal
Sep 12, 2024
Sep 12, 2024
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Sep 3, 2024
Sep 2, 2024
(Electronic) Receipt
Appeal
Sep 2, 2024
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Jan 29, 2024
Jan 23, 2024
(Electronic) Receipt
Appeal
Jan 23, 2024
Jan 23, 2024
Nov 3, 2023
Oct 27, 2023
(Electronic) Receipt
Appeal
Oct 27, 2023
Oct 27, 2023
Oct 10, 2023
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Jan 16, 2023
(Electronic) Receipt
Appeal
Jan 16, 2023
(Electronic) Receipt
Appeal
Jan 16, 2023
Jan 16, 2023
Jan 16, 2023
Jan 16, 2023
Reply to appeal
Appeal
Jan 16, 2023
Reply to appeal
Appeal
Sep 6, 2022
Sep 6, 2022
Aug 31, 2022
(Electronic) Receipt
Appeal
Aug 31, 2022
(Electronic) Receipt
Appeal
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Claims
Appeal
Aug 31, 2022
Claims
Appeal
Aug 31, 2022
Claims
Appeal
Aug 31, 2022
Claims
Appeal
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Aug 31, 2022
Jun 27, 2022
Jun 27, 2022
Jun 22, 2022
(Electronic) Receipt
Appeal
Jun 22, 2022
Jun 22, 2022
Notice of appeal
Appeal
Jun 3, 2022
Jun 3, 2022
May 27, 2022
May 27, 2022
May 24, 2022
May 24, 2022
May 24, 2022
May 24, 2022
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May 19, 2022
May 18, 2022
(Electronic) Receipt
Appeal
May 18, 2022
Authorisation
Appeal
May 18, 2022
May 18, 2022
Notice of appeal
Appeal
May 17, 2022
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Means of redress
OPPO
Apr 21, 2022
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Nov 26, 2021
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Authorisation
OPPO
Nov 26, 2021
Authorisation
OPPO
Nov 26, 2021
Nov 26, 2021
Nov 23, 2021
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Jan 19, 2021
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Jun 14, 2019
May 29, 2019
May 13, 2019
Apr 4, 2019
Decision to grant a European patent
Search/Exam
Mar 21, 2019
(Electronic) Receipt
Search/Exam
Mar 21, 2019
Filing of the translations of the claims
Search/Exam
Mar 21, 2019
French translation of claims
Search/Exam
Mar 21, 2019
German translation of the claims
Search/Exam
Mar 21, 2019
Letter accompanying subsequently filed items
Search/Exam
Nov 23, 2018
Nov 23, 2018
Nov 23, 2018
Intention to grant (signatures)
Search/Exam
Nov 23, 2018
Text intended for grant (clean copy)
Search/Exam
Nov 23, 2018
Aug 23, 2018
(Electronic) Receipt
Search/Exam
Aug 23, 2018
Letter accompanying subsequently filed items
Search/Exam
Aug 23, 2018
Jun 19, 2018
Annex to the communication
Search/Exam
Jun 19, 2018
Communication from the Examining Division
Search/Exam
Jun 12, 2018
Examination started
Search/Exam
Jan 11, 2018
(Electronic) Receipt
Search/Exam
Jan 11, 2018
Annex
Search/Exam
Jan 11, 2018
Letter accompanying subsequently filed items
Search/Exam
Jan 11, 2018
Reply to Written Opinion prepared by the EPO
Search/Exam
Sep 27, 2017
Jul 26, 2017
Jul 24, 2017
Communication to designated inventor
Search/Exam
Jul 19, 2017
Priority search results copy provided by EPO
Search/Exam
Jul 4, 2017
Jun 7, 2017
(Electronic) Receipt
Search/Exam
Jun 7, 2017
Request for entry into the European phase
Search/Exam
May 2, 2017
Information on entry into European phase
Search/Exam
Jul 12, 2016
Jun 23, 2016
Copy of the international search report
Search/Exam
Jun 23, 2016
Published international application - A1
Search/Exam
Feb 16, 2016
Feb 16, 2016
Feb 16, 2016
Feb 4, 2016
Jan 20, 2016
Jan 20, 2016
RO101 Declaration
PCTRO
Dec 23, 2015
Dec 16, 2015
(Electronic) Receipt
PCTRO
Dec 16, 2015
Abstract
PCTRO
Dec 16, 2015
Claims
PCTRO
Dec 16, 2015
Description
PCTRO
Dec 16, 2015
Dec 16, 2015
Drawings
PCTRO
Dec 16, 2015