The weekly litigation news digest is live. Subscribe now
The patent EP3882304 was granted to Sekisui Chemical on Dec 13, 2023. The application was filed on Jul 25, 2019 under application number EP19883379A. The patent is currently recorded with a legal status of "Revoked".

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 |
|---|---|---|---|
| MCE TECHNICAL CENTER | Sep 13, 2024 | IPECUNIA | ADMISSIBLE |
| SIMONA | Sep 13, 2024 | ADVOTEC | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE2842005 |
| DESCRIPTION | JP2004517978 |
| DESCRIPTION | JP2014240492 |
| INTERNATIONAL-SEARCH-REPORT | JP2009510217 |
| INTERNATIONAL-SEARCH-REPORT | JP2017019887 |
| INTERNATIONAL-SEARCH-REPORT | WO2017043532 |
| INTERNATIONAL-SEARCH-REPORT | WO2018047693 |
| OPPOSITION | DE102006012990 |
| OPPOSITION | JP2006111822 |
| OPPOSITION | JP2009510217 |
| OPPOSITION | JP2015059161 |
| OPPOSITION | JP2017019887 |
| OPPOSITION | JP6285085B |
| OPPOSITION | US2007225412 |
| OPPOSITION | US2009143512 |
| OPPOSITION | US2022325099 |
| OPPOSITION | US9260585 |
| OPPOSITION | WO2007037887 |
| OPPOSITION | WO2017043532 |
| OPPOSITION | WO2018047693 |
| OPPOSITION | WO2018117181 |
| OTHER | EP3511375 |
| OTHER | JP2006111822 |
| OTHER | JP2009510217 |
| OTHER | JP2017019887 |
| OTHER | JP6285085B |
| OTHER | US2007225412 |
| OTHER | WO2007037887 |
| OTHER | WO2017043532 |
| OTHER | WO2018047693 |
| SEARCH | JP6285085B |
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 30, 2025
May 30, 2025
May 30, 2025
Feb 24, 2025
Feb 24, 2025
Feb 13, 2025
Feb 13, 2025
Feb 13, 2025
Oct 22, 2024
Oct 22, 2024
Oct 22, 2024
Oct 16, 2024
Oct 15, 2024
Oct 15, 2024
Oct 15, 2024
Oct 15, 2024
Oct 15, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 19, 2024
Sep 16, 2024
Sep 16, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Sep 13, 2024
Jan 3, 2024
Nov 16, 2023
Decision to grant a European patent
Search/Exam
Nov 2, 2023
(Electronic) Receipt
Search/Exam
Nov 2, 2023
Filing of the translations of the claims
Search/Exam
Nov 2, 2023
French translation of claims
Search/Exam
Nov 2, 2023
German translation of the claims
Search/Exam
Jul 3, 2023
Jul 3, 2023
Jul 3, 2023
Jul 3, 2023
Intention to grant (signatures)
Search/Exam
Jul 3, 2023
Text intended for grant (clean copy)
Search/Exam
Jul 3, 2023
Jun 19, 2023
Examination started
Search/Exam
Mar 28, 2023
Mar 28, 2023
Mar 22, 2023
(Electronic) Receipt
Search/Exam
Mar 22, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Non-patent literature filed by a third party
Search/Exam
Mar 22, 2023
Observations by third parties
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Mar 22, 2023
Patent document filed by a Third party
Search/Exam
Jan 20, 2023
(Electronic) Receipt
Search/Exam
Jan 20, 2023
Jan 20, 2023
Jan 20, 2023
Amended claims with annotations
Search/Exam
Jan 20, 2023
Amended claims with annotations
Search/Exam
Jan 20, 2023
Amendments received before examination
Search/Exam
Jan 20, 2023
Letter accompanying subsequently filed items
Search/Exam
Jul 22, 2022
Jul 5, 2022
Jul 5, 2022
European search opinion
Search/Exam
Jul 5, 2022
Information on Search Strategy
Search/Exam
Jul 5, 2022
Supplementary European search report
Search/Exam
Jun 24, 2022
Search started
Search/Exam
Aug 25, 2021
Notification of forthcoming publication
Search/Exam
Jun 22, 2021
May 25, 2021
May 25, 2021
Apr 12, 2021
(Electronic) Receipt
Search/Exam
Apr 12, 2021
Abstract
Search/Exam
Apr 12, 2021
Claims
Search/Exam
Apr 12, 2021
Description
Search/Exam
Apr 12, 2021
Drawings
Search/Exam
Apr 12, 2021
Request for entry into the European phase
Search/Exam
Mar 26, 2021
Information on entry into European phase
Search/Exam
Jun 11, 2020
Jun 11, 2020
May 22, 2020
Copy of the international search report
Search/Exam
May 22, 2020
May 22, 2020
International publication pamphlet
Search/Exam