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The patent EP2420546 was granted to E I DU Pont DE Nemours on Apr 8, 2020. The application was filed on Aug 31, 2007 under application number EP11189771A. 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 |
|---|---|---|---|
| ARKEMA FRANCE | Jan 26, 2018 | LECA | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US20050156348 |
| DESCRIPTION | US20050167330 |
| DESCRIPTION | US20050218259 |
| DESCRIPTION | US20060369227 |
| DESCRIPTION | US20060393109 |
| DESCRIPTION | US20060486791 |
| DESCRIPTION | US6066768 |
| DESCRIPTION | US6184187 |
| OPPOSITION | EP0394992 |
| OPPOSITION | EP0421790 |
| OPPOSITION | EP0539719 |
| OPPOSITION | US3475461 |
| OPPOSITION | US5039442 |
| OPPOSITION | US5194171 |
| OPPOSITION | US84183906P |
| OPPOSITION | US84188206P |
| OPPOSITION | US84194706P |
| OPPOSITION | US84197706P |
| OPPOSITION | WO2005103192 |
| OPPOSITION | WO2007053697 |
| OPPOSITION | WO2008027518 |
| OPPOSITION | WO9210453 |
| SEARCH | US2006033072 |
| SEARCH | WO2005103192 |
| SEARCH | WO2007053697 |
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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Mar 12, 2020
Mar 12, 2020
Mar 6, 2020
Feb 28, 2020
Feb 28, 2020
Feb 28, 2020
Feb 28, 2020
Feb 28, 2020
Nov 26, 2019
Nov 26, 2019
Nov 14, 2019
Nov 12, 2019
Refund of fees
Appeal
Nov 11, 2019
Nov 6, 2019
Refund of fees
Appeal
Nov 5, 2019
Oct 25, 2019
Oct 24, 2019
Oct 22, 2019
(Electronic) Receipt
Appeal
Oct 22, 2019
Oct 22, 2019
Withdrawal of an appeal
Appeal
Oct 21, 2019
(Electronic) Receipt
Appeal
Oct 21, 2019
Oct 21, 2019
Withdrawal of an appeal
Appeal
Aug 21, 2019
Aug 14, 2019
(Electronic) Receipt
Appeal
Aug 14, 2019
Aug 14, 2019
Notice of appeal
Appeal
Aug 9, 2019
Jul 31, 2019
Processing of an appeal
Appeal
Jul 29, 2019
(Electronic) Receipt
Appeal
Jul 29, 2019
Jul 29, 2019
Notice of appeal
Appeal
Jul 22, 2019
Jun 24, 2019
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Jun 19, 2019
Jun 12, 2019
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Jun 12, 2019
Means of redress
OPPO
Apr 15, 2019
Apr 9, 2019
(Electronic) Receipt
Search/Exam
Apr 9, 2019
Description
Search/Exam
Apr 9, 2019
Letter accompanying subsequently filed items
Search/Exam
Apr 9, 2019
Apr 2, 2019
Apr 2, 2019
Apr 2, 2019
Mar 20, 2019
Mar 20, 2019
Mar 11, 2019
Mar 7, 2019
Mar 7, 2019
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Mar 6, 2019
Claims
OPPO
Mar 6, 2019
Description
OPPO
Mar 6, 2019
Description
OPPO
Mar 6, 2019
Mar 6, 2019
Feb 27, 2019
Feb 27, 2019
Feb 27, 2019
Feb 22, 2019
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Jan 11, 2019
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Apr 26, 2017
Mar 30, 2017
Decision to grant a European patent
Search/Exam
Mar 28, 2017
Mar 28, 2017
Mar 16, 2017
(Electronic) Receipt
Search/Exam
Mar 16, 2017
Filing of the translations of the claims
Search/Exam
Mar 16, 2017
French translation of claims
Search/Exam
Mar 16, 2017
German translation of the claims
Search/Exam
Mar 16, 2017
Letter accompanying subsequently filed items
Search/Exam
Dec 21, 2016
Dec 21, 2016
Dec 21, 2016
Intention to grant (signatures)
Search/Exam
Dec 21, 2016
Text intended for grant (clean copy)
Search/Exam
Dec 21, 2016
Dec 5, 2016
Examination started
Search/Exam
May 24, 2016
May 11, 2016
Payment of fees and costs
Search/Exam
May 11, 2016
Apr 10, 2015
CDS Clean up - amended applicant details
Search/Exam
Apr 7, 2015
Jan 19, 2015
(Electronic) Receipt
Search/Exam
Jan 19, 2015
Jan 19, 2015
Amended description with annotations
Search/Exam
Jan 19, 2015
Amendments received before examination
Search/Exam
Jan 19, 2015
Letter accompanying subsequently filed items
Search/Exam
Oct 29, 2014
(Electronic) Receipt
Search/Exam
Oct 29, 2014
Oct 29, 2014
Amendments received before examination
Search/Exam
Oct 29, 2014
Letter accompanying subsequently filed items
Search/Exam
Jul 30, 2014
Refund of fees
Search/Exam
May 12, 2014
Apr 3, 2014
Apr 3, 2014
European search opinion
Search/Exam
Apr 3, 2014
European search report
Search/Exam
Mar 17, 2014
Search started
Search/Exam
Jul 11, 2013
Mar 15, 2012
Letter concerning the inventor
Search/Exam
Feb 22, 2012
Feb 14, 2012
Letter which had not been notified
Search/Exam
Jan 25, 2012
Notification of forthcoming publication
Search/Exam
Nov 18, 2011
Abstract
Search/Exam
Nov 18, 2011
Nov 18, 2011
Claims
Search/Exam
Nov 18, 2011
Description
Search/Exam
Nov 18, 2011
Designation of inventor
Search/Exam
Nov 18, 2011
Designation of inventor
Search/Exam
Nov 18, 2011
Designation of inventor
Search/Exam
Nov 18, 2011
Designation of inventor
Search/Exam
Nov 18, 2011
Designation of inventor
Search/Exam
Nov 18, 2011
Request for grant of a European patent
Search/Exam
Mar 31, 2008
Mar 31, 2008
Mar 31, 2008
Mar 31, 2008