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The patent EP2544841 was granted to Celgard on Jul 7, 2021. The application was filed on Mar 11, 2011 under application number EP11754128A. 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 |
|---|---|---|---|
| TREOFAN GERMANY | Oct 16, 2018 | MAI BESIER | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US4464238 |
| DESCRIPTION | US6057061 |
| DESCRIPTION | US6080507 |
| DESCRIPTION | US6368742 |
| DESCRIPTION | US6602593 |
| INTERNATIONAL-SEARCH-REPORT | US2007196638 |
| INTERNATIONAL-SEARCH-REPORT | US2008118827 |
| INTERNATIONAL-SEARCH-REPORT | US6811643 |
| OPPOSITION | EP1291380 |
| OPPOSITION | US2001038942 |
| OPPOSITION | US4138459 |
| OPPOSITION | US4257997 |
| OPPOSITION | US4298666 |
| OPPOSITION | US4330499 |
| OPPOSITION | US5013439 |
| OPPOSITION | US5051225 |
| OPPOSITION | US5328760 |
| OPPOSITION | US5565281 |
| OPPOSITION | US6602593 |
| OPPOSITION | WO2007098339 |
| SEARCH | EP1081775 |
| SEARCH | WO02051938 |
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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Description
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Decision to grant a European patent
Search/Exam
Dec 13, 2017
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Intention to grant (signatures)
Search/Exam
Dec 13, 2017
Text intended for grant (clean copy)
Search/Exam
Dec 13, 2017
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Nov 30, 2017
(Electronic) Receipt
Search/Exam
Nov 30, 2017
Amended claims with annotations
Search/Exam
Nov 30, 2017
Claims
Search/Exam
Nov 30, 2017
French translation of claims
Search/Exam
Nov 30, 2017
German translation of the claims
Search/Exam
Nov 30, 2017
Letter accompanying subsequently filed items
Search/Exam
Nov 30, 2017
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Intention to grant (signatures)
Search/Exam
Aug 17, 2017
Text intended for grant (clean copy)
Search/Exam
Aug 17, 2017
Mar 22, 2017
(Electronic) Receipt
Search/Exam
Mar 22, 2017
Amended claims with annotations
Search/Exam
Mar 22, 2017
Claims
Search/Exam
Mar 22, 2017
Letter accompanying subsequently filed items
Search/Exam
Mar 22, 2017
Nov 22, 2016
Annex to the communication
Search/Exam
Nov 22, 2016
Communication from the Examining Division
Search/Exam
Oct 26, 2016
(Electronic) Receipt
Search/Exam
Oct 26, 2016
Amended description with annotations
Search/Exam
Oct 26, 2016
Description
Search/Exam
Oct 26, 2016
Letter accompanying subsequently filed items
Search/Exam
Oct 26, 2016
Jul 1, 2016
Annex to the communication
Search/Exam
Jul 1, 2016
Communication from the Examining Division
Search/Exam
Jun 23, 2016
Jun 17, 2016
May 13, 2016
Examination started
Search/Exam
Jan 26, 2016
(Electronic) Receipt
Search/Exam
Jan 26, 2016
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Amended claims with annotations
Search/Exam
Jan 26, 2016
Amendments received before examination
Search/Exam
Jan 26, 2016
Letter accompanying subsequently filed items
Search/Exam
Aug 18, 2015
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European search opinion
Search/Exam
Jul 31, 2015
Supplementary European search report
Search/Exam
Jul 22, 2015
Search started
Search/Exam
Dec 19, 2012
Oct 19, 2012
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 17, 2012
Communication to designated inventor
Search/Exam
Oct 16, 2012
Oct 4, 2012
(Electronic) Receipt
Search/Exam
Oct 4, 2012
Oct 4, 2012
Oct 4, 2012
Amendments received before examination
Search/Exam
Oct 4, 2012
Request for entry into the European phase
Search/Exam
Jul 20, 2012
Information on entry into European phase
Search/Exam
Oct 6, 2011
Oct 6, 2011
Sep 19, 2011
Notification of election of EPO
Search/Exam
Sep 15, 2011
Copy of the international search report
Search/Exam
Sep 15, 2011
Published international application - A1
Search/Exam