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The patent EP2726437 was granted to Refractory on May 30, 2018. The application was filed on Apr 24, 2013 under application number EP13720316A. 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 |
|---|---|---|---|
| SAINT GOBAIN | Feb 22, 2019 | SAINT GOBAIN RECHERCHE | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP0546432 |
| EXAMINATION | WO2012110923 |
| INTERNATIONAL-SEARCH-REPORT | DE1571328 |
| INTERNATIONAL-SEARCH-REPORT | EP0573029 |
| INTERNATIONAL-SEARCH-REPORT | EP0940376 |
| INTERNATIONAL-SEARCH-REPORT | GB1533890 |
| INTERNATIONAL-SEARCH-REPORT | JPS6461351 |
| INTERNATIONAL-SEARCH-REPORT | US3194672 |
| INTERNATIONAL-SEARCH-REPORT | US3551172 |
| INTERNATIONAL-SEARCH-REPORT | US4141743 |
| INTERNATIONAL-SEARCH-REPORT | US4999325 |
| INTERNATIONAL-SEARCH-REPORT | US5180698 |
| INTERNATIONAL-SEARCH-REPORT | WO2004063652 |
| OPPOSITION | FR2647435 |
| OPPOSITION | US2010004114 |
| OPPOSITION | WO2012110923 |
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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May 4, 2018
Decision to grant a European patent
Search/Exam
Mar 29, 2018
(Electronic) Receipt
Search/Exam
Mar 29, 2018
English translation of the claims
Search/Exam
Mar 29, 2018
French translation of claims
Search/Exam
Mar 29, 2018
Letter accompanying subsequently filed items
Search/Exam
Jan 26, 2018
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Intention to grant (signatures)
Search/Exam
Jan 26, 2018
Text intended for grant (clean copy)
Search/Exam
Jan 26, 2018
Dec 13, 2017
Description
Search/Exam
Dec 13, 2017
Sep 22, 2017
Annex to the communication
Search/Exam
Sep 22, 2017
Communication from the Examining Division
Search/Exam
Mar 21, 2017
Letter concerning fees and payments
Search/Exam
Mar 21, 2017
Payment of fees and costs
Search/Exam
Mar 8, 2016
Payment of fees and costs
Search/Exam
Mar 8, 2016
Payment of fees and costs
Search/Exam
Feb 15, 2016
Claims
Search/Exam
Feb 15, 2016
Nov 27, 2015
Annex to the communication
Search/Exam
Nov 27, 2015
Communication from the Examining Division
Search/Exam
Sep 17, 2015
Jun 12, 2015
Annex to the communication
Search/Exam
Jun 12, 2015
Communication from the Examining Division
Search/Exam
May 4, 2015
Communication to designated inventor
Search/Exam
May 4, 2015
Communication to designated inventor
Search/Exam
May 4, 2015
Communication to designated inventor
Search/Exam
Apr 28, 2015
Claims
Search/Exam
Apr 28, 2015
Claims
Search/Exam
Apr 28, 2015
Claims
Search/Exam
Apr 28, 2015
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Search/Exam
Apr 28, 2015
Claims
Search/Exam
Apr 28, 2015
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Annex to the communication
Search/Exam
Dec 1, 2014
Communication from the Examining Division
Search/Exam
Nov 14, 2014
Examination started
Search/Exam
Jul 3, 2014
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Amendments received before examination
Search/Exam
Jul 3, 2014
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Apr 3, 2014
Copy of the international search report
Search/Exam
Apr 3, 2014
Copy of the international search report
Search/Exam
Apr 3, 2014
Published international application - A1
Search/Exam
Feb 20, 2014
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Priority search results copy provided by EPO
Search/Exam
Jan 2, 2014
Dec 18, 2013
Claims filed under Art.19 PCT
Search/Exam
Dec 18, 2013
Reply by International Bureau
Search/Exam
Dec 9, 2013
Enquiry with the International Bureau
Search/Exam
Dec 4, 2013
Payment of fees and costs
Search/Exam
Dec 4, 2013
Payment of fees and costs
Search/Exam
Nov 22, 2013
Information regarding early processing
Search/Exam
Nov 13, 2013
(Electronic) Receipt
Search/Exam
Nov 13, 2013
Request for entry into the European phase
Search/Exam
Jun 26, 2013
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Apr 24, 2013
(Electronic) Receipt
PCTRO
Apr 24, 2013
Abstract
PCTRO
Apr 24, 2013
Claims
PCTRO
Apr 24, 2013
Description
PCTRO
Apr 24, 2013
Drawings
PCTRO
Apr 24, 2013