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The patent EP3423508 was granted to DOW on Apr 27, 2022. The application was filed on Feb 23, 2017 under application number EP17709857A. 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 |
|---|---|---|---|
| COVESTRO DEUTSCHLAND | Jan 27, 2023 | LEVPAT | ADMISSIBLE |
| ACR III | Jan 25, 2023 | DE CLERCQ & PARTNERS | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US4246391 |
| INTERNATIONAL-SEARCH-REPORT | EP2479197 |
| INTERNATIONAL-SEARCH-REPORT | US2001025062 |
| INTERNATIONAL-SEARCH-REPORT | US2003210879 |
| INTERNATIONAL-SEARCH-REPORT | WO2008120984 |
| OPPOSITION | AU2004224898 |
| OPPOSITION | DE102012219479 |
| OPPOSITION | DE4111828 |
| OPPOSITION | EP1361240 |
| OPPOSITION | EP1935860 |
| OPPOSITION | EP2479197 |
| OPPOSITION | JP2009073922 |
| OPPOSITION | JPH11106452 |
| OPPOSITION | US2001025062 |
| OPPOSITION | US2003210879 |
| OPPOSITION | US2004010061 |
| OPPOSITION | US2005239955 |
| OPPOSITION | US2006051593 |
| OPPOSITION | US2006052524 |
| OPPOSITION | US2008277013 |
| OPPOSITION | US2010234529 |
| OPPOSITION | US2015232610 |
| OPPOSITION | US4180640 |
| OPPOSITION | US4246391 |
| OPPOSITION | US4321349 |
| OPPOSITION | US4507458 |
| OPPOSITION | US5906863 |
| OPPOSITION | US6646057 |
| OPPOSITION | US7326752 |
| OPPOSITION | US7396882 |
| OPPOSITION | US8419978 |
| OPPOSITION | WO0078833 |
| OPPOSITION | WO2008120984 |
| OPPOSITION | WO2012004088 |
| OPPOSITION | WO2012076686 |
| OPPOSITION | WO2015011180 |
| OPPOSITION | WO2015155195 |
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.
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May 11, 2022
Mar 31, 2022
Decision to grant a European patent
Search/Exam
Mar 16, 2022
(Electronic) Receipt
Search/Exam
Mar 16, 2022
Filing of the translations of the claims
Search/Exam
Mar 16, 2022
French translation of claims
Search/Exam
Mar 16, 2022
German translation of the claims
Search/Exam
Nov 29, 2021
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Intention to grant (signatures)
Search/Exam
Nov 29, 2021
Text intended for grant (clean copy)
Search/Exam
Nov 29, 2021
Jun 11, 2021
(Electronic) Receipt
Search/Exam
Jun 11, 2021
Amended description with annotations
Search/Exam
Jun 11, 2021
Description
Search/Exam
Jun 11, 2021
Letter accompanying subsequently filed items
Search/Exam
Jun 11, 2021
Feb 3, 2021
Annex to the communication
Search/Exam
Feb 3, 2021
Communication from the Examining Division
Search/Exam
Oct 8, 2020
(Electronic) Receipt
Search/Exam
Oct 8, 2020
Amended claims with annotations
Search/Exam
Oct 8, 2020
Claims
Search/Exam
Oct 8, 2020
Letter accompanying subsequently filed items
Search/Exam
Oct 8, 2020
Sep 17, 2020
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(Electronic) Receipt
Search/Exam
Sep 14, 2020
May 11, 2020
Annex to the communication
Search/Exam
May 11, 2020
Communication from the Examining Division
Search/Exam
Jan 30, 2020
Jan 24, 2020
Observations by third parties
Search/Exam
Jan 6, 2020
(Electronic) Receipt
Search/Exam
Jan 6, 2020
Amended claims with annotations
Search/Exam
Jan 6, 2020
Claims
Search/Exam
Jan 6, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 6, 2020
Oct 29, 2019
Annex to the communication
Search/Exam
Oct 29, 2019
Communication from the Examining Division
Search/Exam
Oct 22, 2019
Examination started
Search/Exam
Jul 16, 2019
(Electronic) Receipt
Search/Exam
Jul 16, 2019
Amended claims with annotations
Search/Exam
Jul 16, 2019
Claims
Search/Exam
Jul 16, 2019
Letter accompanying subsequently filed items
Search/Exam
Jul 16, 2019
Matter concerning the application
Search/Exam
Apr 26, 2019
(Electronic) Receipt
Search/Exam
Apr 26, 2019
Apr 26, 2019
Amended claims with annotations
Search/Exam
Apr 26, 2019
Amendments received before examination
Search/Exam
Apr 26, 2019
Letter accompanying subsequently filed items
Search/Exam
Mar 28, 2019
Submission concerning representation
Search/Exam
Dec 12, 2018
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Letter which had not been notified
Search/Exam
Oct 18, 2018
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Communication to designated inventor
Search/Exam
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Communication to designated inventor
Search/Exam
Oct 12, 2018
Communication to designated inventor
Search/Exam
Oct 11, 2018
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Priority search results copy provided by EPO
Search/Exam
Sep 27, 2018
Sep 26, 2018
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(Electronic) Receipt
Search/Exam
Sep 25, 2018
Request for entry into the European phase
Search/Exam
Sep 19, 2018
Jul 13, 2018
Information on entry into European phase
Search/Exam
Sep 25, 2017
Sep 8, 2017
Copy of the international search report
Search/Exam
Sep 8, 2017
Published international application - A1
Search/Exam
May 16, 2017
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