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The patent EP3235842 was granted to Mitsui Chemicals on Oct 11, 2023. The application was filed on Dec 15, 2015 under application number EP15869976A. 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 | Oct 20, 2021 | LEVPAT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| INTERNATIONAL-SEARCH-REPORT | JP2010095606 |
| INTERNATIONAL-SEARCH-REPORT | JP2010265364 |
| INTERNATIONAL-SEARCH-REPORT | JP2010280883 |
| INTERNATIONAL-SEARCH-REPORT | JP2013060542 |
| INTERNATIONAL-SEARCH-REPORT | JP2014084342 |
| INTERNATIONAL-SEARCH-REPORT | JP2014091809 |
| INTERNATIONAL-SEARCH-REPORT | JP2015003945 |
| INTERNATIONAL-SEARCH-REPORT | JPH06100648 |
| OPPOSITION | EP2684867 |
| OPPOSITION | JP2011105886 |
| OPPOSITION | JP2012107101 |
| OPPOSITION | JP2012121984 |
| OPPOSITION | JP5270446B |
| SEARCH | JP2012107101 |
| SEARCH | JP5270446B |
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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Decision to grant a European patent
Search/Exam
Nov 19, 2020
(Electronic) Receipt
Search/Exam
Nov 19, 2020
Filing of the translations of the claims
Search/Exam
Nov 19, 2020
French translation of claims
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Nov 19, 2020
German translation of the claims
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Nov 19, 2020
Letter accompanying subsequently filed items
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Intention to grant (signatures)
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Aug 13, 2020
Text intended for grant (clean copy)
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Sep 5, 2019
(Electronic) Receipt
Search/Exam
Sep 5, 2019
Amended description with annotations
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Sep 5, 2019
Description
Search/Exam
Sep 5, 2019
Letter accompanying subsequently filed items
Search/Exam
Sep 5, 2019
Jul 22, 2019
Annex to the communication
Search/Exam
Jul 22, 2019
Communication from the Examining Division
Search/Exam
Jul 9, 2019
Examination started
Search/Exam
Jan 7, 2019
(Electronic) Receipt
Search/Exam
Jan 7, 2019
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Amended claims with annotations
Search/Exam
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Amended description with annotations
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Jan 7, 2019
Amendments received before examination
Search/Exam
Jan 7, 2019
Letter accompanying subsequently filed items
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Jul 26, 2018
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European search opinion
Search/Exam
Jul 9, 2018
Information on Search Strategy
Search/Exam
Jul 9, 2018
Supplementary European search report
Search/Exam
Jun 26, 2018
Search started
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Sep 27, 2017
Notification of forthcoming publication
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Jul 28, 2017
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Communication to designated inventor
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Communication to designated inventor
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Communication to designated inventor
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Communication to designated inventor
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Jul 12, 2017
Refund of fees
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Jul 3, 2017
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(Electronic) Receipt
Search/Exam
Jun 7, 2017
Abstract
Search/Exam
Jun 7, 2017
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Amendments received before examination
Search/Exam
Jun 7, 2017
Claims
Search/Exam
Jun 7, 2017
Description
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
Jun 23, 2016
International publication pamphlet
Search/Exam