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The patent EP3750930 was granted to LG Chem on May 3, 2023. The application was filed on Jan 23, 2019 under application number EP19751771A. 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 |
|---|---|---|---|
| INEOS STYROLUTION GROUP | Feb 1, 2024 | JACOBI | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| EXAMINATION | EP3243875 |
| INTERNATIONAL-SEARCH-REPORT | KR20000026020 |
| INTERNATIONAL-SEARCH-REPORT | KR20160048331 |
| INTERNATIONAL-SEARCH-REPORT | KR20160129746 |
| INTERNATIONAL-SEARCH-REPORT | KR950005861 |
| INTERNATIONAL-SEARCH-REPORT | KR950018237 |
| OPPOSITION | CN1840556 |
| OPPOSITION | DE102005022632 |
| OPPOSITION | JPH11209405 |
| OPPOSITION | WO2008020012 |
| OPPOSITION | WO2014170406 |
| OPPOSITION | WO2014170407 |
| SEARCH | EP3243875 |
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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Oct 1, 2025
Oct 1, 2025
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Sep 29, 2025
(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Jul 28, 2025
Jul 28, 2025
Notice of appeal
Appeal
May 28, 2025
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Means of redress
OPPO
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Decision to grant a European patent
Search/Exam
Mar 24, 2023
(Electronic) Receipt
Search/Exam
Mar 24, 2023
Filing of the translations of the claims
Search/Exam
Mar 24, 2023
French translation of claims
Search/Exam
Mar 24, 2023
German translation of the claims
Search/Exam
Feb 2, 2023
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Intention to grant (signatures)
Search/Exam
Feb 2, 2023
Text intended for grant (clean copy)
Search/Exam
Feb 2, 2023
Jan 11, 2023
Examination started
Search/Exam
Aug 5, 2022
Jul 25, 2022
(Electronic) Receipt
Search/Exam
Jul 25, 2022
Enquiry as to the processing of the file
Search/Exam
Jul 25, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 7, 2021
(Electronic) Receipt
Search/Exam
Jul 7, 2021
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Amended claims with annotations
Search/Exam
Jul 7, 2021
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Amended description with annotations
Search/Exam
Jul 7, 2021
Amendments received before examination
Search/Exam
Jul 7, 2021
Letter accompanying subsequently filed items
Search/Exam
Feb 23, 2021
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European search opinion
Search/Exam
Feb 5, 2021
Information on Search Strategy
Search/Exam
Feb 5, 2021
Supplementary European search report
Search/Exam
Jan 22, 2021
Search started
Search/Exam
Nov 18, 2020
Notification of forthcoming publication
Search/Exam
Sep 11, 2020
Communication to designated inventor
Search/Exam
Sep 11, 2020
Communication to designated inventor
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Sep 11, 2020
Communication to designated inventor
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Sep 11, 2020
Communication to designated inventor
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Communication to designated inventor
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Sep 11, 2020
Communication to designated inventor
Search/Exam
Sep 11, 2020
Communication to designated inventor
Search/Exam
Sep 11, 2020
Aug 24, 2020
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Jun 2, 2020
Information regarding early processing
Search/Exam
May 18, 2020
(Electronic) Receipt
Search/Exam
May 18, 2020
Abstract
Search/Exam
May 18, 2020
May 18, 2020
Amended description with annotations
Search/Exam
May 18, 2020
Claims
Search/Exam
May 18, 2020
Description
Search/Exam
May 18, 2020
Request for entry into the European phase
Search/Exam
Sep 2, 2019
Sep 2, 2019
Aug 15, 2019
Copy of the international search report
Search/Exam
Aug 15, 2019
Aug 15, 2019
International publication pamphlet
Search/Exam