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The patent EP3418343 was granted to Mitsui Chemicals on Dec 27, 2023. The application was filed on Feb 16, 2017 under application number EP17753263A. 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 |
|---|---|---|---|
| COVESTRO DEUTSCHLAND | Sep 16, 2021 | LEVPAT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | JP2010059362 |
| DESCRIPTION | JPS61129173 |
| DESCRIPTION | WO2012121291 |
| INTERNATIONAL-SEARCH-REPORT | JP2010059362 |
| INTERNATIONAL-SEARCH-REPORT | JP2011162656 |
| OPPOSITION | EP1234842 |
| OPPOSITION | EP1930358 |
| OPPOSITION | EP1939232 |
| OPPOSITION | EP3321086 |
| OPPOSITION | JP2005089734 |
| OPPOSITION | JP2010059362 |
| SEARCH | JP2011162656 |
| SEARCH | JP2013060542 |
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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OPPO
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Annexes in respect of a client data request
Search/Exam
Mar 23, 2023
Letter accompanying subsequently filed items
Search/Exam
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Description
OPPO
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Decision to grant a European patent
Search/Exam
Nov 4, 2020
(Electronic) Receipt
Search/Exam
Nov 4, 2020
Filing of the translations of the claims
Search/Exam
Nov 4, 2020
French translation of claims
Search/Exam
Nov 4, 2020
German translation of the claims
Search/Exam
Nov 4, 2020
Letter accompanying subsequently filed items
Search/Exam
Jul 23, 2020
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Intention to grant (signatures)
Search/Exam
Jul 23, 2020
Text intended for grant (clean copy)
Search/Exam
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Examination started
Search/Exam
Feb 3, 2020
(Electronic) Receipt
Search/Exam
Feb 3, 2020
Maintenance of the application
Search/Exam
Oct 10, 2019
Sep 23, 2019
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European search opinion
Search/Exam
Sep 23, 2019
Information on Search Strategy
Search/Exam
Sep 23, 2019
Supplementary European search report
Search/Exam
Sep 4, 2019
Search started
Search/Exam
Nov 28, 2018
Notification of forthcoming publication
Search/Exam
Sep 26, 2018
Sep 24, 2018
Communication to designated inventor
Search/Exam
Sep 24, 2018
Communication to designated inventor
Search/Exam
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Communication to designated inventor
Search/Exam
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Communication to designated inventor
Search/Exam
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Communication to designated inventor
Search/Exam
Sep 24, 2018
Communication to designated inventor
Search/Exam
Sep 6, 2018
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Information regarding early processing
Search/Exam
Jul 17, 2018
(Electronic) Receipt
Search/Exam
Jul 17, 2018
Abstract
Search/Exam
Jul 17, 2018
Claims
Search/Exam
Jul 17, 2018
Description
Search/Exam
Jul 17, 2018
Request for entry into the European phase
Search/Exam
Jun 29, 2018
Information on entry into European phase
Search/Exam
May 22, 2018
Notification of the recording of a change
Search/Exam
Sep 12, 2017
Aug 24, 2017
Copy of the international search report
Search/Exam
Aug 24, 2017
Aug 24, 2017
International publication pamphlet
Search/Exam