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The patent EP3397663 was granted to Braskem America on Oct 19, 2022. The application was filed on Dec 23, 2016 under application number EP16882468A. 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 |
|---|---|---|---|
| BOREALIS | Jul 19, 2023 | MAIWALD | ADMISSIBLE |
| WR GRACE & CONN | Jul 17, 2023 | KUTZENBERGER WOLFF & PARTNER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| INTERNATIONAL-SEARCH-REPORT | US2006089471 |
| INTERNATIONAL-SEARCH-REPORT | US2006173132 |
| INTERNATIONAL-SEARCH-REPORT | US2012302701 |
| INTERNATIONAL-SEARCH-REPORT | WO2015150467 |
| OPPOSITION | EP0373660 |
| OPPOSITION | EP0863183 |
| OPPOSITION | EP1211289 |
| OPPOSITION | EP1661935 |
| OPPOSITION | EP3246358 |
| OPPOSITION | US10113058 |
| OPPOSITION | US5298561 |
| OPPOSITION | WO2006053661 |
| OPPOSITION | WO2006061109 |
| OPPOSITION | WO2006065649 |
| OPPOSITION | WO2007093376 |
| OPPOSITION | WO2008019722 |
| OPPOSITION | WO2008074423 |
| OPPOSITION | WO2009019277 |
| OPPOSITION | WO2011066194 |
| OPPOSITION | WO2011076354 |
| OPPOSITION | WO2012149368 |
| OPPOSITION | WO2012162396 |
| OPPOSITION | WO2013092615 |
| OPPOSITION | WO2013092620 |
| OPPOSITION | WO2014094990 |
| OPPOSITION | WO2014160311 |
| OPPOSITION | WO2015117948 |
| OPPOSITION | WO2015177094 |
| SEARCH | EP2746295 |
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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Dec 10, 2025
Dec 10, 2025
Dec 5, 2025
(Electronic) Receipt
Appeal
Dec 5, 2025
Dec 5, 2025
Oct 9, 2025
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Oct 3, 2025
(Electronic) Receipt
Appeal
Oct 3, 2025
Notice of appeal
Appeal
Oct 3, 2025
Notice of appeal
Appeal
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Means of redress
Search/Exam
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Annex
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Sep 22, 2022
Decision to grant a European patent
Search/Exam
Aug 22, 2022
(Electronic) Receipt
Search/Exam
Aug 22, 2022
Filing of the translations of the claims
Search/Exam
Aug 22, 2022
French translation of claims
Search/Exam
Aug 22, 2022
German translation of the claims
Search/Exam
Aug 22, 2022
Letter accompanying subsequently filed items
Search/Exam
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Intention to grant (signatures)
Search/Exam
May 4, 2022
Text intended for grant (clean copy)
Search/Exam
May 4, 2022
Dec 23, 2021
Examination started
Search/Exam
Nov 19, 2019
(Electronic) Receipt
Search/Exam
Nov 19, 2019
Nov 19, 2019
Amended claims with annotations
Search/Exam
Nov 19, 2019
Amendments received before examination
Search/Exam
Nov 19, 2019
Letter accompanying subsequently filed items
Search/Exam
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European search opinion
Search/Exam
May 17, 2019
Information on Search Strategy
Search/Exam
May 17, 2019
Supplementary European search report
Search/Exam
May 8, 2019
Search started
Search/Exam
Jan 22, 2019
(Electronic) Receipt
Search/Exam
Jan 22, 2019
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Amended claims with annotations
Search/Exam
Jan 22, 2019
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Search/Exam
Jan 22, 2019
Letter accompanying subsequently filed items
Search/Exam
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Communication to designated inventor
Search/Exam
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Communication to designated inventor
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Communication to designated inventor
Search/Exam
Aug 3, 2018
Communication to designated inventor
Search/Exam
Jul 27, 2018
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(Electronic) Receipt
Search/Exam
Jun 14, 2018
Request for entry into the European phase
Search/Exam
May 14, 2018
Information on entry into European phase
Search/Exam
Jul 24, 2017
Jul 6, 2017
Copy of the international search report
Search/Exam
Jul 6, 2017
Published international application - A1
Search/Exam