The weekly litigation news digest is live. Subscribe now
The patent EP3728459 was granted to Sabic on Nov 15, 2023. The application was filed on Dec 18, 2018 under application number EP18816127A. 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 |
|---|---|---|---|
| BASELL POLIOLEFINE ITALIA | Aug 14, 2024 | LYONDELLBASELL | ADMISSIBLE |
| INEOS EUROPE | Aug 13, 2024 | MATHISEN & MACARA | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | WO2017EP73148 |
| DESCRIPTION | US4866022 |
| INTERNATIONAL-SEARCH-REPORT | US2016046737 |
| OPPOSITION | EP2527376 |
| OPPOSITION | EP2913350 |
| OPPOSITION | EP3728406 |
| OPPOSITION | JP2003048996 |
| OPPOSITION | US2011014449 |
| OPPOSITION | US2012108771 |
| OPPOSITION | US2016046737 |
| OPPOSITION | US6350828 |
| OPPOSITION | WO2014152692 |
| OPPOSITION | WO2018069541 |
| OPPOSITION | WO2019121701 |
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
Dec 8, 2025
Dec 8, 2025
Dec 5, 2025
Dec 5, 2025
Authorisation
OPPO
Dec 5, 2025
Dec 5, 2025
Dec 5, 2025
Dec 3, 2025
Dec 3, 2025
Dec 2, 2025
Dec 2, 2025
Dec 2, 2025
Dec 2, 2025
Dec 2, 2025
Dec 1, 2025
Dec 1, 2025
Dec 1, 2025
Nov 27, 2025
Nov 27, 2025
Nov 27, 2025
May 28, 2025
May 28, 2025
May 28, 2025
May 28, 2025
May 28, 2025
May 28, 2025
Apr 24, 2025
Apr 24, 2025
Apr 24, 2025
Apr 24, 2025
Apr 24, 2025
Apr 16, 2025
Apr 16, 2025
Apr 16, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 11, 2025
Apr 8, 2025
Apr 8, 2025
Apr 8, 2025
Apr 8, 2025
Apr 8, 2025
Apr 8, 2025
Dec 23, 2024
Dec 23, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Nov 6, 2024
Nov 6, 2024
Oct 31, 2024
Oct 31, 2024
Oct 31, 2024
Oct 31, 2024
Oct 31, 2024
Aug 30, 2024
Aug 30, 2024
Aug 30, 2024
Aug 20, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 14, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Aug 13, 2024
Nov 28, 2023
Oct 19, 2023
Decision to grant a European patent
Search/Exam
Oct 5, 2023
(Electronic) Receipt
Search/Exam
Oct 5, 2023
Filing of the translations of the claims
Search/Exam
Oct 5, 2023
French translation of claims
Search/Exam
Oct 5, 2023
German translation of the claims
Search/Exam
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Jun 15, 2023
Intention to grant (signatures)
Search/Exam
Jun 15, 2023
Text intended for grant (clean copy)
Search/Exam
Jun 15, 2023
May 30, 2023
Examination started
Search/Exam
Apr 30, 2021
Decision to allow further processing
Search/Exam
Apr 21, 2021
Decision to allow further processing
Search/Exam
Apr 12, 2021
(Electronic) Receipt
Search/Exam
Apr 12, 2021
Apr 12, 2021
Amended claims with annotations
Search/Exam
Apr 12, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 12, 2021
Request for further processing
Search/Exam
Mar 11, 2021
Sep 30, 2020
Aug 6, 2020
Jul 30, 2020
Priority search results copy provided by EPO
Search/Exam
Jul 27, 2020
Communication to designated inventor
Search/Exam
Jul 27, 2020
Communication to designated inventor
Search/Exam
Jul 27, 2020
Communication to designated inventor
Search/Exam
Jul 27, 2020
Communication to designated inventor
Search/Exam
Jul 27, 2020
Communication to designated inventor
Search/Exam
Jul 17, 2020
(Electronic) Receipt
Search/Exam
Jul 17, 2020
Request for entry into the European phase
Search/Exam
Jul 6, 2020
May 4, 2020
Information on entry into European phase
Search/Exam
Jul 18, 2019
Jun 27, 2019
Copy of the international search report
Search/Exam
Jun 27, 2019
Published international application - A1
Search/Exam
Feb 14, 2019
Feb 14, 2019
Feb 14, 2019
Jan 3, 2019
Dec 18, 2018
(Electronic) Receipt
PCTRO
Dec 18, 2018
Abstract
PCTRO
Dec 18, 2018
Claims
PCTRO
Dec 18, 2018
Description
PCTRO
Dec 18, 2018
Dec 18, 2018
Dec 18, 2018