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The patent EP3921486 was granted to Terreal on Sep 21, 2022. The application was filed on Feb 3, 2020 under application number EP20707508A. 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 |
|---|---|---|---|
| ERLUS | Jun 21, 2023 | LOUIS POHLAU LOHRENTZ | ADMISSIBLE |
| ERLUS | Jun 21, 2023 | ROTHINGER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| INTERNATIONAL-SEARCH-REPORT | EP0175500 |
| INTERNATIONAL-SEARCH-REPORT | FR2277954 |
| INTERNATIONAL-SEARCH-REPORT | FR2592082 |
| INTERNATIONAL-SEARCH-REPORT | FR2612227 |
| INTERNATIONAL-SEARCH-REPORT | JPH02266051 |
| INTERNATIONAL-SEARCH-REPORT | JPH10299178 |
| OPPOSITION | DE2626618 |
| OPPOSITION | DE3025813 |
| OPPOSITION | EP0175500 |
| OPPOSITION | EP0303993 |
| OPPOSITION | EP0432783 |
| OPPOSITION | FR2277954 |
| OPPOSITION | FR2592082 |
| OPPOSITION | FR2612227 |
| OPPOSITION | FR2800406 |
| OPPOSITION | JP2019112899 |
| OPPOSITION | JPH02266051 |
| OPPOSITION | JPH10299178 |
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 23, 2025
Sep 22, 2025
(Electronic) Receipt
Appeal
Sep 22, 2025
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(Electronic) Receipt
Appeal
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Notice of appeal
Appeal
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Aug 25, 2022
Decision to grant a European patent
Search/Exam
Aug 11, 2022
(Electronic) Receipt
Search/Exam
Aug 11, 2022
English translation of the claims
Search/Exam
Aug 11, 2022
Filing of the translations of the claims
Search/Exam
Aug 11, 2022
German translation of the claims
Search/Exam
Aug 11, 2022
Letter accompanying subsequently filed items
Search/Exam
May 10, 2022
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Intention to grant (signatures)
Search/Exam
May 10, 2022
Text intended for grant (clean copy)
Search/Exam
May 10, 2022
Apr 25, 2022
Examination started
Search/Exam
Mar 10, 2022
(Electronic) Receipt
Search/Exam
Mar 10, 2022
Mar 10, 2022
Amended description with annotations
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Mar 10, 2022
Amendments received before examination
Search/Exam
Mar 10, 2022
Letter accompanying subsequently filed items
Search/Exam
Nov 17, 2021
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Priority search results copy provided by EPO
Search/Exam
Aug 23, 2021
Aug 4, 2021
Information regarding early processing
Search/Exam
Jul 23, 2021
(Electronic) Receipt
Search/Exam
Jul 23, 2021
Request for entry into the European phase
Search/Exam
Jun 18, 2021
Information on entry into European phase
Search/Exam
Aug 31, 2020
Aug 13, 2020
Copy of the international search report
Search/Exam
Aug 13, 2020
Published international application - A1
Search/Exam