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The patent EP3543537 was granted to Grundfos Holding on Oct 15, 2025. The application was filed on Mar 23, 2018 under application number EP18163562A. 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 |
|---|---|---|---|
| WILO | Oct 5, 2022 | MICHALSKI HUTTERMANN & PARTNER PATENTANWALTE MBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| EXAMINATION | WO2017221217 |
| OPPOSITION | US6379127 |
| OPPOSITION | WO2017221217 |
| SEARCH | US2003211626 |
| SEARCH | US2014116513 |
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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Description
OPPO
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Description
OPPO
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Decision to grant a European patent
Search/Exam
Nov 30, 2021
(Electronic) Receipt
Search/Exam
Nov 30, 2021
English translation of the claims
Search/Exam
Nov 30, 2021
Filing of the translations of the claims
Search/Exam
Nov 30, 2021
French translation of claims
Search/Exam
Nov 30, 2021
Letter accompanying subsequently filed items
Search/Exam
Aug 23, 2021
Advice of delivery
Search/Exam
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Acknowledgement of a document
Search/Exam
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Intention to grant (signatures)
Search/Exam
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Text intended for grant (clean copy)
Search/Exam
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Intention to grant (signatures)
Search/Exam
Mar 3, 2021
Text intended for grant (clean copy)
Search/Exam
Mar 3, 2021
Feb 11, 2021
Examination started
Search/Exam
Mar 19, 2020
(Electronic) Receipt
Search/Exam
Mar 19, 2020
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Amended claims with annotations
Search/Exam
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Amended description with annotations
Search/Exam
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Amendments received before examination
Search/Exam
Mar 19, 2020
Letter accompanying subsequently filed items
Search/Exam
Sep 30, 2019
Aug 28, 2019
Notification of forthcoming publication
Search/Exam
Jan 22, 2019
Submission concerning representation
Search/Exam
Jan 17, 2019
Submission concerning representation
Search/Exam
Sep 5, 2018
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European search opinion
Search/Exam
Sep 5, 2018
European search report
Search/Exam
Sep 5, 2018
Information on Search Strategy
Search/Exam
Aug 27, 2018
Search started
Search/Exam
Jul 11, 2018
Communication to designated inventor
Search/Exam
Jun 28, 2018
(Electronic) Receipt
Search/Exam
Jun 28, 2018
Designation of inventor
Search/Exam
Jun 28, 2018
Letter accompanying subsequently filed items
Search/Exam
Jun 28, 2018
Letter concerning the inventor
Search/Exam
May 16, 2018
Communication to designated inventor
Search/Exam
May 11, 2018
EPO/applicant correspondence crossed
Search/Exam
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Deficiency in designation of inventor
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(Electronic) Receipt
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Apr 19, 2018
Designation of inventor
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Apr 19, 2018
Letter accompanying subsequently filed items
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Apr 19, 2018
Letter concerning the inventor
Search/Exam
Mar 23, 2018
Abstract
Search/Exam
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Claims
Search/Exam
Mar 23, 2018
Description
Search/Exam
Mar 23, 2018
Drawings
Search/Exam
Mar 23, 2018
Request for grant of a European patent
Search/Exam