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The patent EP3400316 was granted to Arconic on Aug 20, 2025. The application was filed on Dec 30, 2016 under application number EP16884235A. 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 |
|---|---|---|---|
| ALVANCE ALUMINIUM DUFFEL | Jun 15, 2021 | MULLER SCHUPFNER & PARTNER PATENT UND RECHTSANWALTSPARTNERSCHAFT MBB MUC | ADMISSIBLE |
| C TEC CONSTELLIUM TECHNOLOGY CENTER CONSTELLIUM NEUF BRISACH | Jun 10, 2021 | CONSTELLIUM PROPRIETE INDUSTRIELLE | ADMISSIBLE |
| NOVELIS | May 27, 2021 | WEICKMANN & WEICKMANN PARTMBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US20020078638 |
| DESCRIPTION | US2014000768 |
| DESCRIPTION | US37737603 |
| DESCRIPTION | US5496423 |
| DESCRIPTION | US6672368 |
| INTERNATIONAL-SEARCH-REPORT | US2008178973 |
| INTERNATIONAL-SEARCH-REPORT | US2010247369 |
| INTERNATIONAL-SEARCH-REPORT | US2014000768 |
| INTERNATIONAL-SEARCH-REPORT | US2014248177 |
| INTERNATIONAL-SEARCH-REPORT | WO2005080619 |
| OPPOSITION | CN100453671C |
| OPPOSITION | CN101935785 |
| OPPOSITION | CN1974814 |
| OPPOSITION | DE202004007397U |
| OPPOSITION | EP0531118 |
| OPPOSITION | EP1392877 |
| OPPOSITION | JP2000313932 |
| OPPOSITION | JP2004183025 |
| OPPOSITION | JP2004211176 |
| OPPOSITION | JP2007009262 |
| OPPOSITION | JP2015224377 |
| OPPOSITION | JPH0874014 |
| OPPOSITION | US2004011438 |
| OPPOSITION | US2005183801 |
| OPPOSITION | US2005211350 |
| OPPOSITION | US2006042727 |
| OPPOSITION | US5496423 |
| OPPOSITION | US5514228 |
| OPPOSITION | WO03031108 |
| OPPOSITION | WO2014135367 |
| OPPOSITION | WO2017001790 |
| SEARCH | US2002005232 |
| SEARCH | US2008178973 |
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.
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Decision to grant a European patent
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French translation of claims
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Letter accompanying subsequently filed items
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Letter accompanying subsequently filed items
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Letter accompanying subsequently filed items
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Amended claims with annotations
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Claims
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Jan 31, 2020
Description
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Jan 31, 2020
Letter accompanying subsequently filed items
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Jan 31, 2020
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Annex to the communication
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Communication from the Examining Division
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Examination started
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(Electronic) Receipt
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Amended claims with annotations
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Letter accompanying subsequently filed items
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European search opinion
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Information on Search Strategy
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Supplementary European search report
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Search started
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Communication to designated inventor
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Communication to designated inventor
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Letter accompanying subsequently filed items
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Letter concerning the inventor
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Letter accompanying subsequently filed items
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Letter concerning the inventor
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Oct 29, 2018
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Letter which had not been notified
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Letter which had not been notified
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Communication to designated inventor
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Communication to designated inventor
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Communication to designated inventor
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Amended claims with annotations
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Amendments received before examination
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Request for entry into the European phase
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May 18, 2018
Information on entry into European phase
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Aug 1, 2017
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Copy of the international search report
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Published international application - A1
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