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The patent EP3313908 was granted to Kemira OYJ on Aug 11, 2021. The application was filed on May 11, 2016 under application number EP16723789A. 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 |
|---|---|---|---|
| SNF | May 9, 2022 | CABINET LAURENT & CHARRAS | ADMISSIBLE |
| SNF | May 9, 2022 | IPSILON | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | CN104311841 |
| DESCRIPTION | EP0438707 |
| DESCRIPTION | US2008000601 |
| DESCRIPTION | US4421602 |
| INTERNATIONAL-SEARCH-REPORT | US2008196852 |
| INTERNATIONAL-SEARCH-REPORT | US2009314446 |
| INTERNATIONAL-SEARCH-REPORT | US2011155339 |
| INTERNATIONAL-SEARCH-REPORT | US5753759 |
| INTERNATIONAL-SEARCH-REPORT | WO2006027242 |
| OPPOSITION | EP0919578 |
| OPPOSITION | EP2840100 |
| OPPOSITION | US2008196852 |
| OPPOSITION | US2009314446 |
| OPPOSITION | US2011112224 |
| OPPOSITION | US2011155339 |
| OPPOSITION | US5753759 |
| OPPOSITION | US9567710 |
| OPPOSITION | WO02083743 |
| OPPOSITION | WO2006027242 |
| OPPOSITION | WO9848112 |
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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Nov 12, 2025
Nov 11, 2025
(Electronic) Receipt
Appeal
Nov 11, 2025
Nov 11, 2025
Nov 7, 2025
Nov 7, 2025
Oct 29, 2025
Oct 29, 2025
Refund of fees
Appeal
Oct 24, 2025
(Electronic) Receipt
Appeal
Oct 24, 2025
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Oct 21, 2025
(Electronic) Receipt
Appeal
Oct 21, 2025
Oct 21, 2025
Withdrawal of an appeal
Appeal
Sep 23, 2025
Sep 23, 2025
Aug 14, 2025
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Aug 12, 2025
(Electronic) Receipt
Appeal
Aug 12, 2025
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(Electronic) Receipt
Appeal
Aug 8, 2025
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Jul 25, 2024
(Electronic) Receipt
Appeal
Jul 25, 2024
(Electronic) Receipt
Appeal
Jul 25, 2024
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Jul 25, 2024
Reply to appeal
Appeal
Jul 25, 2024
Reply to appeal
Appeal
Mar 25, 2024
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Mar 20, 2024
(Electronic) Receipt
Appeal
Mar 20, 2024
(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Jan 19, 2024
Notice of appeal
Appeal
Jan 19, 2024
Notice of appeal
Appeal
Jan 18, 2024
(Electronic) Receipt
Appeal
Jan 18, 2024
Jan 18, 2024
Notice of appeal
Appeal
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Means of redress
OPPO
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Aug 24, 2021
Jul 15, 2021
Decision to grant a European patent
Search/Exam
Jul 6, 2021
(Electronic) Receipt
Search/Exam
Jul 6, 2021
Filing of the translations of the claims
Search/Exam
Jul 6, 2021
French translation of claims
Search/Exam
Jul 6, 2021
German translation of the claims
Search/Exam
Jul 6, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 1, 2021
Mar 25, 2021
Mar 23, 2021
Mar 23, 2021
Mar 23, 2021
Intention to grant (signatures)
Search/Exam
Mar 23, 2021
Text intended for grant (clean copy)
Search/Exam
Mar 23, 2021
May 7, 2020
(Electronic) Receipt
Search/Exam
May 7, 2020
Amended claims with annotations
Search/Exam
May 7, 2020
Amended description with annotations
Search/Exam
May 7, 2020
Claims
Search/Exam
May 7, 2020
Description
Search/Exam
May 7, 2020
Letter accompanying subsequently filed items
Search/Exam
May 7, 2020
Jan 8, 2020
Annex to the communication
Search/Exam
Jan 8, 2020
Communication from the Examining Division
Search/Exam
Dec 20, 2019
Examination started
Search/Exam
Aug 28, 2018
Aug 23, 2018
Apr 5, 2018
Mar 23, 2018
(Electronic) Receipt
Search/Exam
Mar 23, 2018
Letter accompanying subsequently filed items
Search/Exam
Mar 23, 2018
Reply to Written Opinion prepared by the EPO
Search/Exam
Feb 1, 2018
Jan 30, 2018
Communication to designated inventor
Search/Exam
Jan 30, 2018
Communication to designated inventor
Search/Exam
Jan 30, 2018
Communication to designated inventor
Search/Exam
Jan 30, 2018
Communication to designated inventor
Search/Exam
Jan 8, 2018
Nov 23, 2017
(Electronic) Receipt
Search/Exam
Nov 23, 2017
Priority search results
Search/Exam
Nov 23, 2017
Request for entry into the European phase
Search/Exam
Nov 13, 2017
Nov 13, 2017
Notification of the recording of a change
Search/Exam
Nov 6, 2017
Information on entry into European phase
Search/Exam
Jan 16, 2017
Dec 29, 2016
Copy of the international search report
Search/Exam
Dec 29, 2016
Published international application - A1
Search/Exam
Nov 29, 2016
Jul 21, 2016
ISR: cited documents
PCTISA
Jul 20, 2016
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Jun 2, 2016
May 20, 2016
Abstract
PCTISA
May 20, 2016
Claims
PCTISA
May 20, 2016
Description
PCTISA
May 20, 2016