The weekly litigation news digest is live. Subscribe now
The patent EP3666360 was granted to Eurofilters on Jun 11, 2025. The application was filed on Mar 15, 2017 under application number EP20154822A. 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 |
|---|---|---|---|
| CARL FREUDENBERG | Jun 15, 2022 | CPW | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | CN101747596 |
| DESCRIPTION | DE19919809 |
| DESCRIPTION | DE202006020047U |
| DESCRIPTION | DE202008003248U |
| DESCRIPTION | DE202008005050U |
| DESCRIPTION | EP0960645 |
| DESCRIPTION | EP1198280 |
| DESCRIPTION | EP1254693 |
| DESCRIPTION | EP1795247 |
| DESCRIPTION | EP1795427 |
| DESCRIPTION | EP2263508 |
| DESCRIPTION | EP2301404 |
| DESCRIPTION | EP2433695 |
| DESCRIPTION | EP2442703 |
| DESCRIPTION | WO0103802 |
| DESCRIPTION | WO2011047764 |
| DESCRIPTION | WO2011057641 |
| DESCRIPTION | WO2011057651 |
| DESCRIPTION | WO2013106392 |
| OPPOSITION | CN103147163 |
| OPPOSITION | CN105999856 |
| OPPOSITION | EP1019174 |
| OPPOSITION | EP1402934 |
| OPPOSITION | EP2826895 |
| OPPOSITION | JP2000328369 |
| OPPOSITION | JP2001172828 |
| OPPOSITION | JP2001327814 |
| OPPOSITION | JP2003334412 |
| OPPOSITION | JP2004131862 |
| OPPOSITION | JP2005060886 |
| OPPOSITION | JP2006328600 |
| OPPOSITION | JP2007254908 |
| OPPOSITION | JPH07251015 |
| OPPOSITION | JPH09220419 |
| OPPOSITION | JPH09276637 |
| OPPOSITION | KR20120070858 |
| OPPOSITION | KR20120133548 |
| OPPOSITION | US2010029161 |
| OPPOSITION | WO2006044018 |
| OPPOSITION | WO2012025451 |
| SEARCH | DE202008016836U |
| SEARCH | EP2826895 |
| SEARCH | US2004022996 |
| SEARCH | US2006135021 |
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
Get instant alerts for new documents
May 15, 2025
May 15, 2025
May 7, 2025
May 7, 2025
May 7, 2025
May 7, 2025
Mar 14, 2025
Mar 14, 2025
Mar 14, 2025
Mar 12, 2025
Refund of fees
Appeal
Mar 11, 2025
Mar 11, 2025
Mar 7, 2025
Mar 7, 2025
Mar 6, 2025
Mar 5, 2025
Mar 4, 2025
(Electronic) Receipt
Appeal
Mar 4, 2025
Mar 4, 2025
Mar 4, 2025
Mar 4, 2025
Withdrawal of an appeal
Appeal
Feb 27, 2025
(Electronic) Receipt
Appeal
Feb 27, 2025
Feb 27, 2025
Feb 25, 2025
Feb 25, 2025
Feb 19, 2025
(Electronic) Receipt
Appeal
Feb 19, 2025
Feb 19, 2025
Notice of appeal
Appeal
Jan 27, 2025
Jan 27, 2025
Jan 20, 2025
Jan 14, 2025
Jan 9, 2025
Jan 9, 2025
Jan 9, 2025
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Means of redress
OPPO
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 20, 2024
Dec 18, 2024
Nov 21, 2024
Oct 2, 2024
Sep 27, 2024
Sep 27, 2024
Sep 27, 2024
Sep 27, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Sep 20, 2024
Mar 14, 2024
Mar 14, 2024
Mar 14, 2024
Mar 14, 2024
Mar 14, 2024
Mar 14, 2024
Mar 14, 2024
Feb 21, 2024
Feb 21, 2024
Feb 21, 2024
Jan 9, 2024
Jan 4, 2024
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 22, 2023
Dec 20, 2023
Dec 19, 2023
Dec 19, 2023
Dec 19, 2023
Dec 12, 2023
Dec 12, 2023
Dec 12, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 10, 2023
May 3, 2023
May 3, 2023
Mar 15, 2023
Mar 9, 2023
Mar 9, 2023
Mar 9, 2023
Nov 18, 2022
Nov 10, 2022
Nov 10, 2022
Nov 10, 2022
Jun 30, 2022
Jun 30, 2022
Jun 24, 2022
Refund of fees
OPPO
Jun 21, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 15, 2022
Jun 7, 2022
Jun 7, 2022
Sep 28, 2021
Aug 19, 2021
Decision to grant a European patent
Search/Exam
Aug 5, 2021
(Electronic) Receipt
Search/Exam
Aug 5, 2021
English translation of the claims
Search/Exam
Aug 5, 2021
French translation of claims
Search/Exam
Aug 5, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 9, 2021
Apr 9, 2021
Apr 9, 2021
Intention to grant (signatures)
Search/Exam
Apr 9, 2021
Text intended for grant (clean copy)
Search/Exam
Apr 9, 2021
Mar 30, 2021
Dec 7, 2020
Examination started
Search/Exam
Nov 23, 2020
(Electronic) Receipt
Search/Exam
Nov 23, 2020
Nov 23, 2020
Amended claims with annotations
Search/Exam
Nov 23, 2020
Amendments received before examination
Search/Exam
Nov 23, 2020
Letter accompanying subsequently filed items
Search/Exam
Jun 22, 2020
May 20, 2020
Notification of forthcoming publication
Search/Exam
Mar 25, 2020
Communication to designated inventor
Search/Exam
Mar 25, 2020
Communication to designated inventor
Search/Exam
Feb 25, 2020
Feb 25, 2020
European search opinion
Search/Exam
Feb 25, 2020
European search report
Search/Exam
Feb 25, 2020
Information on Search Strategy
Search/Exam
Feb 13, 2020
Search started
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Feb 10, 2020
Priority search results copy provided by EPO
Search/Exam
Jan 31, 2020
Abstract
Search/Exam
Jan 31, 2020
Jan 31, 2020
Claims
Search/Exam
Jan 31, 2020
Description
Search/Exam
Jan 31, 2020
Designation of inventor
Search/Exam
Jan 31, 2020
Request for grant of a European patent
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 19, 2018
Priority search results copy provided by EPO
Search/Exam
Oct 10, 2017
Oct 10, 2017
Oct 10, 2017
Oct 10, 2017
Oct 10, 2017
Oct 10, 2017