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The patent EP3221529 was granted to Georgia Pacific Gypsum on Dec 23, 2020. The application was filed on Nov 17, 2015 under application number EP15860138A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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 | Sep 22, 2021 | MURGITROYD | - |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE4107623 |
| DESCRIPTION | US4564544 |
| DESCRIPTION | US7736720 |
| DESCRIPTION | US8323785 |
| INTERNATIONAL-SEARCH-REPORT | JP2005035866 |
| INTERNATIONAL-SEARCH-REPORT | KR20030094130 |
| INTERNATIONAL-SEARCH-REPORT | US2007059513 |
| INTERNATIONAL-SEARCH-REPORT | US2009152519 |
| INTERNATIONAL-SEARCH-REPORT | US2014158273 |
| OPPOSITION | AU5584480 |
| OPPOSITION | CA1225670 |
| OPPOSITION | CN101367658 |
| OPPOSITION | CN102964133 |
| OPPOSITION | DE4107623 |
| OPPOSITION | EP2678290 |
| OPPOSITION | GB718546 |
| OPPOSITION | JP2005035866 |
| OPPOSITION | KR20030094130 |
| OPPOSITION | US2007059513 |
| OPPOSITION | US2009152519 |
| OPPOSITION | US2011195241 |
| OPPOSITION | US2014158273 |
| OPPOSITION | US3616173 |
| OPPOSITION | US4564544 |
| OPPOSITION | US4722866 |
| OPPOSITION | US5220762 |
| OPPOSITION | US5791109 |
| OPPOSITION | US7736720 |
| OPPOSITION | WO2004041874 |
| OPPOSITION | WO2016081390 |
| SEARCH | DE4107623 |
| SEARCH | US2007059513 |
| SEARCH | US2011195241 |
| SEARCH | US4564544 |
| SEARCH | US5220762 |
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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Dec 22, 2025
Dec 22, 2025
Dec 10, 2025
Dec 4, 2025
(Electronic) Receipt
Appeal
Dec 4, 2025
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(Electronic) Receipt
Appeal
Aug 21, 2025
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Reply to appeal
Appeal
Apr 25, 2025
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(Electronic) Receipt
Appeal
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Appeal
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Notice of appeal
Appeal
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Authorisation
OPPO
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Decision to grant a European patent
Search/Exam
Oct 7, 2020
(Electronic) Receipt
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Oct 7, 2020
Filing of the translations of the claims
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Oct 7, 2020
French translation of claims
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Oct 7, 2020
German translation of the claims
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Jun 10, 2020
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Intention to grant (signatures)
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Jun 10, 2020
Text intended for grant (clean copy)
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Jun 10, 2020
Apr 29, 2020
(Electronic) Receipt
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Apr 29, 2020
Amended claims with annotations
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Apr 29, 2020
Amended description with annotations
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Apr 29, 2020
Claims
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Apr 29, 2020
Description
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Apr 29, 2020
Drawings
Search/Exam
Apr 29, 2020
Letter accompanying subsequently filed items
Search/Exam
Apr 29, 2020
Mar 13, 2020
Annex to the communication
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Mar 13, 2020
Communication from the Examining Division
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Jun 11, 2019
Claims
Search/Exam
Jun 11, 2019
Mar 29, 2019
Annex to the communication
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Mar 29, 2019
Communication from the Examining Division
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Mar 25, 2019
Examination started
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Feb 4, 2019
Amendments received before examination
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Feb 4, 2019
Claims
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Jul 24, 2018
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European search opinion
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Jul 6, 2018
Information on Search Strategy
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Jul 6, 2018
Supplementary European search report
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Jan 17, 2018
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Amendments received before examination
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Jan 4, 2018
Aug 30, 2017
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Communication to designated inventor
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Communication to designated inventor
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Jun 7, 2017
May 11, 2017
(Electronic) Receipt
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May 11, 2017
Request for entry into the European phase
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Mar 31, 2017
Information on entry into European phase
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Jun 13, 2016
May 26, 2016
Copy of the international search report
Search/Exam
May 26, 2016
Published international application - A1
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