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The patent EP3842561 was granted to Aleris Rolled Products Germany on Aug 17, 2022. The application was filed on Dec 23, 2019 under application number EP19219448A. 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 |
|---|---|---|---|
| ARCONIC | May 16, 2023 | FORRESTERS | ADMISSIBLE |
| C TEC CONSTELLIUM TECHNOLOGY CENTERCONSTELLIUM ISSOIRE | May 10, 2023 | CONSTELLIUM PROPRIETE INDUSTRIELLE | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP2034035 |
| DESCRIPTION | EP3171996 |
| OPPOSITION | CN102517526 |
| OPPOSITION | US2012085470 |
| OPPOSITION | US2016333453 |
| OPPOSITION | US5213639 |
| OPPOSITION | US5560789 |
| OPPOSITION | US6322647 |
| OPPOSITION | US6994760 |
| OPPOSITION | WO2019222177 |
| SEARCH | US2019136348 |
| SEARCH | WO2018206696 |
| SEARCH | WO2019238509 |
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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Oct 21, 2025
Oct 21, 2025
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Oct 16, 2025
(Electronic) Receipt
Appeal
Oct 16, 2025
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Aug 4, 2025
Notice of appeal
Appeal
Aug 4, 2025
Notice of appeal
Appeal
Jul 22, 2025
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(Electronic) Receipt
Appeal
Jul 17, 2025
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Notice of appeal
Appeal
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Decision to grant a European patent
Search/Exam
Jul 8, 2022
(Electronic) Receipt
Search/Exam
Jul 8, 2022
Filing of the translations of the claims
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Jul 8, 2022
French translation of claims
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Jul 8, 2022
German translation of the claims
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Intention to grant (signatures)
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Jun 1, 2022
Text intended for grant (clean copy)
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May 9, 2022
(Electronic) Receipt
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May 9, 2022
Letter accompanying subsequently filed items
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Annexes in respect of a client data request
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Annexes in respect of a client data request
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Intention to grant (signatures)
Search/Exam
Feb 3, 2022
Text intended for grant (clean copy)
Search/Exam
Feb 3, 2022
Dec 20, 2021
Examination started
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Nov 2, 2021
(Electronic) Receipt
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Nov 2, 2021
Nov 2, 2021
Amended claims with annotations
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Nov 2, 2021
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Amended description with annotations
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Nov 2, 2021
Amendments received before examination
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Nov 2, 2021
Letter accompanying subsequently filed items
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Jul 5, 2021
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Notification of forthcoming publication
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(Electronic) Receipt
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Jun 25, 2020
General authorisation
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Jun 25, 2020
Letter accompanying subsequently filed items
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European search opinion
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European search report
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Apr 23, 2020
Information on Search Strategy
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Apr 7, 2020
Search started
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Feb 14, 2020
Communication to designated inventor
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Dec 23, 2019
Abstract
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Dec 23, 2019
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Claims
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Dec 23, 2019
Description
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Dec 23, 2019
Designation of inventor
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Dec 23, 2019
Drawings
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Dec 23, 2019
Request for grant of a European patent
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