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The patent EP3325426 was granted to Knauf Insulation on Aug 6, 2025. The application was filed on Jul 23, 2015 under application number EP15749984A. 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 |
|---|---|---|---|
| SIKA TECHNOLOGY | Feb 21, 2022 | SIKA PATENT ATTORNEYS | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| EXAMINATION | CN101857404 |
| EXAMINATION | CN102173677 |
| EXAMINATION | DE102013200121 |
| EXAMINATION | DE3937431 |
| EXAMINATION | EP0004628 |
| EXAMINATION | EP1433768 |
| INTERNATIONAL-SEARCH-REPORT | DE102009014957 |
| INTERNATIONAL-SEARCH-REPORT | DE102011007834 |
| INTERNATIONAL-SEARCH-REPORT | DE2264075 |
| INTERNATIONAL-SEARCH-REPORT | EP2090552 |
| INTERNATIONAL-SEARCH-REPORT | EP2223903 |
| INTERNATIONAL-SEARCH-REPORT | WO2004101464 |
| INTERNATIONAL-SEARCH-REPORT | WO2006130031 |
| INTERNATIONAL-SEARCH-REPORT | WO2013113918 |
| INTERNATIONAL-SEARCH-REPORT | WO2014015289 |
| INTERNATIONAL-SEARCH-REPORT | WO9915475 |
| INTERNATIONAL-SEARCH-REPORT | WO9948835 |
| OPPOSITION | DE102010063561 |
| OPPOSITION | HU201284 |
| OPPOSITION | US2002040666 |
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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Jul 10, 2025
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Refund of fees
Appeal
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(Electronic) Receipt
Appeal
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Withdrawal of an appeal
Appeal
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(Electronic) Receipt
Appeal
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Notice of appeal
Appeal
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Means of redress
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Decision to grant a European patent
Search/Exam
Apr 12, 2021
(Electronic) Receipt
Search/Exam
Apr 12, 2021
French translation of claims
Search/Exam
Apr 12, 2021
German translation of the claims
Search/Exam
Apr 12, 2021
Letter accompanying subsequently filed items
Search/Exam
Dec 11, 2020
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Intention to grant (signatures)
Search/Exam
Dec 11, 2020
Text intended for grant (clean copy)
Search/Exam
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(Electronic) Receipt
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Nov 23, 2020
Amended claims with annotations
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Nov 23, 2020
Amended description with annotations
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Nov 23, 2020
Claims
Search/Exam
Nov 23, 2020
Description
Search/Exam
Nov 23, 2020
Letter accompanying subsequently filed items
Search/Exam
Nov 23, 2020
Nov 9, 2020
Advice of delivery
Search/Exam
Nov 9, 2020
Nov 2, 2020
Annex to the communication
Search/Exam
Oct 1, 2020
(Electronic) Receipt
Search/Exam
Oct 1, 2020
Amended claims with annotations
Search/Exam
Oct 1, 2020
Amended claims with annotations
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Oct 1, 2020
Amended claims with annotations
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Amended claims with annotations
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Search/Exam
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Search/Exam
Oct 1, 2020
Letter accompanying subsequently filed items
Search/Exam
Oct 1, 2020
Jul 22, 2020
Annex to the communication
Search/Exam
Jul 22, 2020
Summons to attend oral proceedings
Search/Exam
Aug 2, 2019
(Electronic) Receipt
Search/Exam
Aug 2, 2019
Amended claims with annotations
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Aug 2, 2019
Claims
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Aug 2, 2019
Letter accompanying subsequently filed items
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Aug 2, 2019
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(Electronic) Receipt
Search/Exam
Jun 18, 2019
Letter accompanying subsequently filed items
Search/Exam
Jun 18, 2019
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Communication to designated inventor
Search/Exam
Feb 13, 2019
Communication to designated inventor
Search/Exam
Feb 8, 2019
Annex to the communication
Search/Exam
Feb 8, 2019
Communication from the Examining Division
Search/Exam
Feb 7, 2019
(Electronic) Receipt
Search/Exam
Feb 7, 2019
Letter accompanying subsequently filed items
Search/Exam
Feb 7, 2019
Letter concerning the inventor
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Jan 18, 2019
Examination started
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Aug 31, 2018
(Electronic) Receipt
Search/Exam
Aug 31, 2018
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Amended claims with annotations
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Aug 31, 2018
Amendments received before examination
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Aug 31, 2018
Letter accompanying subsequently filed items
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Mar 2, 2018
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Communication to designated inventor
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Communication to designated inventor
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Feb 5, 2018
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(Electronic) Receipt
Search/Exam
Jan 17, 2018
Request for entry into the European phase
Search/Exam
Dec 4, 2017
Information on entry into European phase
Search/Exam
Jan 26, 2017
Copy of the international search report
Search/Exam
Jan 26, 2017
Published international application - A1
Search/Exam
Mar 16, 2016
ISR: cited documents
PCTISA
Mar 15, 2016
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Aug 27, 2015
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Abstract
PCTRO
Jul 23, 2015
Claims
PCTRO
Jul 23, 2015
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Description
PCTRO
Jul 23, 2015
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Drawings
PCTRO
Jul 23, 2015