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The patent EP3594299 was granted to Asahi Kasei Kabushiki Kaisha on Nov 27, 2024. The application was filed on Mar 1, 2018 under application number EP18763807A. 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 COVESTRO & COKG | Jul 11, 2022 | LEVPAT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | JP2017043141 |
| DESCRIPTION | JP2017169741 |
| DESCRIPTION | JPH0343472 |
| DESCRIPTION | JPS5734107 |
| DESCRIPTION | JPS61275311 |
| INTERNATIONAL-SEARCH-REPORT | JP2009185288 |
| INTERNATIONAL-SEARCH-REPORT | JP2013151645 |
| INTERNATIONAL-SEARCH-REPORT | JP2014005364 |
| INTERNATIONAL-SEARCH-REPORT | JP2015509090 |
| INTERNATIONAL-SEARCH-REPORT | JPH11246646 |
| OPPOSITION | WO2016116376 |
| SEARCH | EP0743332 |
| SEARCH | EP1081171 |
| SEARCH | US2016060380 |
| SEARCH | US6183870 |
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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Aug 16, 2021
(Electronic) Receipt
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Aug 16, 2021
Filing of the translations of the claims
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French translation of claims
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German translation of the claims
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Letter accompanying subsequently filed items
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Intention to grant (signatures)
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Text intended for grant (clean copy)
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(Electronic) Receipt
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Amended description with annotations
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Claims
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Description
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Letter accompanying subsequently filed items
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Annex to the communication
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Communication from the Examining Division
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(Electronic) Receipt
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May 14, 2020
Amended claims with annotations
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May 14, 2020
Claims
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Letter accompanying subsequently filed items
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Annex to the communication
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Communication from the Examining Division
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Information on Search Strategy
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Supplementary European search report
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Dec 18, 2019
Notification of forthcoming publication
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Oct 14, 2019
Communication to designated inventor
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(Electronic) Receipt
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Abstract
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Sep 5, 2019
Claims
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Description
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Sep 5, 2019
Request for entry into the European phase
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Jul 17, 2019
Information on entry into European phase
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Oct 3, 2018
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Sep 27, 2018
Notification of the recording of a change
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Sep 13, 2018
Copy of the international search report
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Sep 13, 2018
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International publication pamphlet
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