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The patent EP3478400 was granted to Keey Aerogel on Sep 2, 2020. The application was filed on Jul 3, 2017 under application number EP17765204A. The patent is currently recorded with a legal status of "Opposition Rejected".

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 |
|---|---|---|---|
| HELWIG | Jun 2, 2021 | VON ROHR PATENTANWALTE PARTNERSCHAFT MBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US6670402 |
| INTERNATIONAL-SEARCH-REPORT | US2463467 |
| INTERNATIONAL-SEARCH-REPORT | WO2006016981 |
| OPPOSITION | EP1757559 |
| OPPOSITION | US2014323589 |
| OPPOSITION | US2463467 |
| OPPOSITION | US6387341 |
| OPPOSITION | US6516537 |
| OPPOSITION | WO2004060633 |
| OPPOSITION | WO2006016981 |
| OPPOSITION | WO2016079040 |
| OPPOSITION | WO9620822 |
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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Sep 4, 2025
Sep 4, 2025
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Jun 20, 2025
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May 30, 2025
(Electronic) Receipt
Appeal
May 30, 2025
(Electronic) Receipt
Appeal
May 30, 2025
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(Electronic) Receipt
Appeal
May 13, 2025
(Electronic) Receipt
Appeal
May 13, 2025
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(Electronic) Receipt
Appeal
Mar 18, 2024
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Oct 2, 2023
Sep 27, 2023
(Electronic) Receipt
Appeal
Sep 27, 2023
Sep 27, 2023
Sep 27, 2023
Sep 27, 2023
Jul 18, 2023
Jul 6, 2023
(Electronic) Receipt
Appeal
Jul 6, 2023
Jul 6, 2023
Jul 6, 2023
Jul 6, 2023
Jul 6, 2023
Reply to appeal
Appeal
May 17, 2023
May 12, 2023
(Electronic) Receipt
Appeal
May 12, 2023
May 12, 2023
Apr 5, 2023
Refund of fees
Appeal
Mar 21, 2023
Mar 16, 2023
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Mar 16, 2023
Mar 10, 2023
(Electronic) Receipt
Appeal
Mar 10, 2023
(Electronic) Receipt
Appeal
Mar 10, 2023
(Electronic) Receipt
Appeal
Mar 10, 2023
Mar 10, 2023
Mar 10, 2023
Mar 10, 2023
Notice of appeal
Appeal
Mar 10, 2023
Notice of appeal
Appeal
Mar 10, 2023
Mar 10, 2023
Feb 8, 2023
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Means of redress
OPPO
Jan 3, 2023
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Abstract
OPPO
Oct 6, 2022
Abstract
OPPO
Oct 6, 2022
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Description
OPPO
Oct 6, 2022
Description
OPPO
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Jan 26, 2021
(Electronic) Receipt
Search/Exam
Jan 26, 2021
Letter accompanying subsequently filed items
Search/Exam
Jan 26, 2021
Sep 14, 2020
Aug 6, 2020
Decision to grant a European patent
Search/Exam
Jul 23, 2020
(Electronic) Receipt
Search/Exam
Jul 23, 2020
Filing of the translations of the claims
Search/Exam
Jul 23, 2020
Letter accompanying subsequently filed items
Search/Exam
Mar 25, 2020
Mar 25, 2020
Mar 25, 2020
Intention to grant (signatures)
Search/Exam
Mar 25, 2020
Text intended for grant (clean copy)
Search/Exam
Mar 25, 2020
Mar 11, 2020
(Electronic) Receipt
Search/Exam
Mar 11, 2020
Claims
Search/Exam
Mar 11, 2020
English translation of the claims
Search/Exam
Mar 11, 2020
German translation of the claims
Search/Exam
Mar 11, 2020
Letter accompanying subsequently filed items
Search/Exam
Mar 11, 2020
Nov 15, 2019
Nov 15, 2019
Nov 15, 2019
Intention to grant (signatures)
Search/Exam
Nov 15, 2019
Text intended for grant (clean copy)
Search/Exam
Nov 15, 2019
Oct 28, 2019
Examination started
Search/Exam
Apr 10, 2019
Feb 12, 2019
Feb 8, 2019
Communication to designated inventor
Search/Exam
Feb 8, 2019
Communication to designated inventor
Search/Exam
Feb 5, 2019
Priority search results copy provided by EPO
Search/Exam
Jan 17, 2019
Jan 17, 2019
Dec 21, 2018
(Electronic) Receipt
Search/Exam
Dec 21, 2018
Request for entry into the European phase
Search/Exam
Nov 16, 2018
Information on entry into European phase
Search/Exam
Jul 4, 2018
Jul 4, 2018
Jul 4, 2018
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Jun 14, 2018
Notification of election of EPO
Search/Exam
May 29, 2018
May 22, 2018
May 3, 2018
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PCT demand form
PCT2
May 3, 2018
May 3, 2018
May 3, 2018
Jan 30, 2018
Jan 11, 2018
Copy of the international search report
Search/Exam
Jan 11, 2018
Copy of the international search report
Search/Exam
Jan 11, 2018
Published international application - A1
Search/Exam
Dec 11, 2017
ISR: cited documents
PCTISA
Dec 11, 2017
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Sep 26, 2017
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Jul 3, 2017
Abstract
PCTISA
Jul 3, 2017
Claims
PCTISA
Jul 3, 2017
Description
PCTISA
Jul 3, 2017
Drawings
PCTISA