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The patent EP3613794 was granted to Daicel on Jan 19, 2022. The application was filed on Feb 6, 2019 under application number EP19751764A. 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 |
|---|---|---|---|
| CERDIA | Oct 19, 2022 | MEISSNER BOLTE PARTNERSCHAFT MBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | JP2004051942 |
| DESCRIPTION | JP2016500129 |
| DESCRIPTION | JP6187653B |
| DESCRIPTION | JPH066307B |
| DESCRIPTION | WO9204408 |
| INTERNATIONAL-SEARCH-REPORT | JP2004269865 |
| INTERNATIONAL-SEARCH-REPORT | JP2007224259 |
| INTERNATIONAL-SEARCH-REPORT | JPS59219333 |
| INTERNATIONAL-SEARCH-REPORT | JPS61211342 |
| INTERNATIONAL-SEARCH-REPORT | WO2016135778 |
| OPPOSITION | CN102911379 |
| OPPOSITION | EP0750007 |
| OPPOSITION | JP2004269865 |
| OPPOSITION | JP2007224259 |
| OPPOSITION | JP6187653B |
| OPPOSITION | KR101555861B |
| OPPOSITION | US2009098288 |
| OPPOSITION | US2010247914 |
| OPPOSITION | US2014113826 |
| OPPOSITION | US2016355662 |
| OPPOSITION | US5064949 |
| OPPOSITION | US5686113 |
| OPPOSITION | WO0235991 |
| OPPOSITION | WO2016135778 |
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 8, 2025
Oct 8, 2025
Aug 14, 2025
Aug 11, 2025
(Electronic) Receipt
Appeal
Aug 11, 2025
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Feb 10, 2025
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(Electronic) Receipt
Appeal
Jan 10, 2025
(Electronic) Receipt
Appeal
Jan 10, 2025
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Reply to appeal
Appeal
Jan 10, 2025
Reply to appeal
Appeal
Sep 10, 2024
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Sep 5, 2024
(Electronic) Receipt
Appeal
Sep 5, 2024
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Jun 28, 2024
Notice of appeal
Appeal
Jun 28, 2024
Notice of appeal
Appeal
Jun 25, 2024
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(Electronic) Receipt
Appeal
Jun 19, 2024
Jun 19, 2024
Notice of appeal
Appeal
May 7, 2024
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Means of redress
OPPO
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Feb 1, 2022
Dec 23, 2021
Decision to grant a European patent
Search/Exam
Dec 23, 2021
Decision to grant a European patent
Search/Exam
Dec 14, 2021
(Electronic) Receipt
Search/Exam
Dec 14, 2021
French translation of claims
Search/Exam
Dec 14, 2021
German translation of the claims
Search/Exam
Dec 14, 2021
Letter accompanying subsequently filed items
Search/Exam
Sep 13, 2021
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Intention to grant (signatures)
Search/Exam
Sep 13, 2021
Text intended for grant (clean copy)
Search/Exam
Sep 13, 2021
Jun 8, 2021
(Electronic) Receipt
Search/Exam
Jun 8, 2021
Amended claims with annotations
Search/Exam
Jun 8, 2021
Claims
Search/Exam
Jun 8, 2021
Letter accompanying subsequently filed items
Search/Exam
Jun 8, 2021
Apr 1, 2021
Annex to the communication
Search/Exam
Apr 1, 2021
Communication from the Examining Division
Search/Exam
Mar 17, 2021
Examination started
Search/Exam
Jan 15, 2021
(Electronic) Receipt
Search/Exam
Jan 15, 2021
Letter accompanying subsequently filed items
Search/Exam
Jan 15, 2021
Maintenance of the application
Search/Exam
Jan 14, 2021
Dec 11, 2020
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European search opinion
Search/Exam
Dec 11, 2020
Information on Search Strategy
Search/Exam
Dec 11, 2020
Supplementary European search report
Search/Exam
Dec 1, 2020
Search started
Search/Exam
Aug 24, 2020
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Jan 29, 2020
Notification of forthcoming publication
Search/Exam
Jan 16, 2020
(Electronic) Receipt
Search/Exam
Jan 16, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 16, 2020
Matter concerning the application
Search/Exam
Nov 29, 2019
Nov 27, 2019
Communication to designated inventor
Search/Exam
Nov 27, 2019
Communication to designated inventor
Search/Exam
Nov 26, 2019
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Nov 20, 2019
(Electronic) Receipt
Search/Exam
Nov 20, 2019
Abstract
Search/Exam
Nov 20, 2019
Nov 20, 2019
Claims
Search/Exam
Nov 20, 2019
Description
Search/Exam
Nov 20, 2019
Drawings
Search/Exam
Nov 20, 2019
Request for entry into the European phase
Search/Exam
Sep 2, 2019
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Aug 15, 2019
Copy of the international search report
Search/Exam
Aug 15, 2019
Aug 15, 2019
International publication pamphlet
Search/Exam