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The patent EP3792471 was granted to Rolls Royce on Nov 5, 2025. The application was filed on Aug 12, 2020 under application number EP20190605A. 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 |
|---|---|---|---|
| SAFRAN AIRCRAFT ENGINES | Mar 6, 2024 | REGIMBEAU | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| OPPOSITION | US2017175675 |
| OPPOSITION | US2017284220 |
| OPPOSITION | US5209644 |
| OPPOSITION | US8678743 |
| SEARCH | US2007130959 |
| SEARCH | US2008223135 |
| SEARCH | US8678743 |
| SEARCH | WO2019038510 |
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 9, 2025
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OPPO
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May 11, 2023
Decision to grant a European patent
Search/Exam
Apr 25, 2023
(Electronic) Receipt
Search/Exam
Apr 25, 2023
Filing of the translations of the claims
Search/Exam
Apr 25, 2023
French translation of claims
Search/Exam
Apr 25, 2023
German translation of the claims
Search/Exam
Mar 17, 2023
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Intention to grant (signatures)
Search/Exam
Mar 17, 2023
Text intended for grant (clean copy)
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Mar 17, 2023
Feb 16, 2023
Examination started
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Sep 17, 2021
(Electronic) Receipt
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Sep 17, 2021
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Amended claims with annotations
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Sep 17, 2021
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Amended description with annotations
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Sep 17, 2021
Amendments received before examination
Search/Exam
Sep 17, 2021
Letter accompanying subsequently filed items
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Mar 22, 2021
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Notification of forthcoming publication
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Feb 5, 2021
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European search opinion
Search/Exam
Feb 5, 2021
European search report
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Feb 5, 2021
Information on Search Strategy
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Jan 22, 2021
Search started
Search/Exam
Oct 5, 2020
Communication to designated inventor
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Aug 14, 2020
Aug 12, 2020
Abstract
Search/Exam
Aug 12, 2020
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Claims
Search/Exam
Aug 12, 2020
Description
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Aug 12, 2020
Designation of inventor
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Aug 12, 2020
Drawings
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Aug 12, 2020
Request for grant of a European patent
Search/Exam