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The patent EP2558544 was granted to EI DU Pont DE Nemours on Sep 4, 2024. The application was filed on Apr 12, 2011 under application number EP11715644A. 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 |
|---|---|---|---|
| DAIKIN INDUSTRIES | Jun 5, 2019 | HOFFMANN EITLE | WITHDRAWN |
| ARKEMA FRANCE | Jun 3, 2019 | ARKEMA PATENT | ADMISSIBLE |
| MEXICHEM FLUOR DE CV | May 29, 2019 | POTTER CLARKSON | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2007179324 |
| DESCRIPTION | US6252099 |
| EXAMINATION | WO2011107698 |
| INTERNATIONAL-SEARCH-REPORT | US2005247905 |
| INTERNATIONAL-SEARCH-REPORT | US2006243944 |
| INTERNATIONAL-SEARCH-REPORT | US2007007488 |
| INTERNATIONAL-SEARCH-REPORT | US2010047189 |
| INTERNATIONAL-SEARCH-REPORT | WO2009018117 |
| INTERNATIONAL-SEARCH-REPORT | WO2010002020 |
| OPPOSITION | US2005247905 |
| OPPOSITION | US2006243944 |
| OPPOSITION | US2007007488 |
| OPPOSITION | US2010047189 |
| OPPOSITION | US2011023507 |
| OPPOSITION | WO2007002625 |
| OPPOSITION | WO2007126414 |
| OPPOSITION | WO2008027555 |
| OPPOSITION | WO2008140809 |
| OPPOSITION | WO2009018117 |
| OPPOSITION | WO2009047535 |
| OPPOSITION | WO2010002020 |
| OPPOSITION | WO2010022018 |
| OPPOSITION | WO2010059677 |
| OPPOSITION | WO2010129920 |
| OPPOSITION | WO2011023923 |
| OPPOSITION | WO2011107698 |
| OTHER | WO2007002625 |
| OTHER | WO2008140809 |
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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Description
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Communication from the Examining Division
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Payment of fees and costs
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Observations by third parties
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Patent document filed by a Third party
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Letter accompanying subsequently filed items
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Jun 3, 2015
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CDS Clean up - amended applicant details
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Apr 7, 2015
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Amended claims with annotations
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Dec 24, 2013
Description
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Dec 24, 2013
Letter accompanying subsequently filed items
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Dec 24, 2013
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Annex to the communication
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Aug 29, 2013
Communication from the Examining Division
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Aug 23, 2013
Examination started
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Amendments received before examination
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Apr 16, 2013
Cover sheet for fax transmission
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Communication to designated inventor
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Communication to designated inventor
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Notification of the recording of a change
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Request for entry into the European phase
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Aug 24, 2012
Information on entry into European phase
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Nov 9, 2011
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Copy of the international search report
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Published international application - A1
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Abstract
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Description
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