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The patent EP3527609 was granted to Kaneka on Aug 14, 2024. The application was filed on Oct 12, 2017 under application number EP17860943A. 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 |
|---|---|---|---|
| KEMIRA OYJ | Jun 8, 2022 | PAGE WHITE FARRER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| INTERNATIONAL-SEARCH-REPORT | JP2001046094 |
| INTERNATIONAL-SEARCH-REPORT | JP2001057895 |
| INTERNATIONAL-SEARCH-REPORT | JP2007077232 |
| INTERNATIONAL-SEARCH-REPORT | JP2007512007 |
| INTERNATIONAL-SEARCH-REPORT | JPH07102053 |
| INTERNATIONAL-SEARCH-REPORT | JPH07509131 |
| INTERNATIONAL-SEARCH-REPORT | JPH08500131 |
| INTERNATIONAL-SEARCH-REPORT | WO2010067541 |
| INTERNATIONAL-SEARCH-REPORT | WO2010067543 |
| OPPOSITION | US2003194443 |
| OPPOSITION | US2007088099 |
| OPPOSITION | US2009155703 |
| OPPOSITION | US2013225761 |
| OPPOSITION | US6716911 |
| OPPOSITION | WO2014023319 |
| SEARCH | WO2014023319 |
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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(Electronic) Receipt
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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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Letter accompanying subsequently filed items
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Maintenance of the application
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European search opinion
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Information on Search Strategy
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Supplementary European search report
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Search started
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Refund of fees
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Notification of forthcoming publication
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Communication to designated inventor
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(Electronic) Receipt
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Abstract
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Claims
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Description
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Request for entry into the European phase
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Information on entry into European phase
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Copy of the international search report
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International publication pamphlet
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