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The patent EP3572538 was granted to AIR Products And Chemicals on Dec 22, 2021. The application was filed on May 22, 2019 under application number EP19176016A. 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 |
|---|---|---|---|
| C TEC CONSTELLIUM TECHNOLOGY CENTER CONSTELLIUM NEUF BRISACH | Sep 21, 2022 | 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 | US4484947 |
| OPPOSITION | EP1790738 |
| OPPOSITION | JP3645306B |
| OPPOSITION | US2014305261 |
| SEARCH | JP3645306B |
| SEARCH | US2014305261 |
| SEARCH | WO9523239 |
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 10, 2025
Oct 10, 2025
Oct 7, 2025
Oct 7, 2025
Jul 30, 2025
Jul 25, 2025
(Electronic) Receipt
Appeal
Jul 25, 2025
Jul 25, 2025
Reply to appeal
Appeal
Mar 27, 2025
Mar 24, 2025
(Electronic) Receipt
Appeal
Mar 24, 2025
Mar 24, 2025
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Jan 29, 2025
(Electronic) Receipt
Appeal
Jan 29, 2025
Jan 29, 2025
Notice of appeal
Appeal
Dec 2, 2024
Dec 2, 2024
Dec 2, 2024
Dec 2, 2024
Dec 2, 2024
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Means of redress
OPPO
Dec 2, 2024
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Jan 12, 2022
Nov 25, 2021
Decision to grant a European patent
Search/Exam
Nov 15, 2021
(Electronic) Receipt
Search/Exam
Nov 15, 2021
Filing of the translations of the claims
Search/Exam
Nov 15, 2021
French translation of claims
Search/Exam
Nov 15, 2021
German translation of the claims
Search/Exam
Nov 15, 2021
Letter accompanying subsequently filed items
Search/Exam
Aug 13, 2021
Aug 13, 2021
Aug 13, 2021
Intention to grant (signatures)
Search/Exam
Aug 13, 2021
Text intended for grant (clean copy)
Search/Exam
Aug 13, 2021
Jun 15, 2021
(Electronic) Receipt
Search/Exam
Jun 15, 2021
Amended claims with annotations
Search/Exam
Jun 15, 2021
Amended description with annotations
Search/Exam
Jun 15, 2021
Claims
Search/Exam
Jun 15, 2021
Description
Search/Exam
Jun 15, 2021
Letter accompanying subsequently filed items
Search/Exam
Jun 15, 2021
Feb 26, 2021
Annex to the communication
Search/Exam
Feb 26, 2021
Communication from the Examining Division
Search/Exam
Dec 18, 2020
(Electronic) Receipt
Search/Exam
Dec 18, 2020
Amended claims with annotations
Search/Exam
Dec 18, 2020
Amended description with annotations
Search/Exam
Dec 18, 2020
Claims
Search/Exam
Dec 18, 2020
Description
Search/Exam
Dec 18, 2020
Letter accompanying subsequently filed items
Search/Exam
Dec 18, 2020
Aug 12, 2020
Annex to the communication
Search/Exam
Aug 12, 2020
Communication from the Examining Division
Search/Exam
Aug 6, 2020
Examination started
Search/Exam
May 27, 2020
(Electronic) Receipt
Search/Exam
May 27, 2020
May 27, 2020
Amended claims with annotations
Search/Exam
May 27, 2020
Amendments received before examination
Search/Exam
May 27, 2020
Letter accompanying subsequently filed items
Search/Exam
Dec 2, 2019
Oct 30, 2019
Notification of forthcoming publication
Search/Exam
Sep 6, 2019
Sep 6, 2019
European search opinion
Search/Exam
Sep 6, 2019
European search report
Search/Exam
Sep 6, 2019
Information on Search Strategy
Search/Exam
Aug 12, 2019
Search started
Search/Exam
Jul 29, 2019
Jul 23, 2019
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
Jul 15, 2019
Communication to designated inventor
Search/Exam
May 22, 2019
Abstract
Search/Exam
May 22, 2019
May 22, 2019
Claims
Search/Exam
May 22, 2019
Description
Search/Exam
May 22, 2019
Designation of inventor
Search/Exam
May 22, 2019
Drawings
Search/Exam
May 22, 2019
Request for grant of a European patent
Search/Exam