Patent No. EP3289226 (titled "Inlet Nozzle For A Radial, Diagonal Or Axial-Flow Fan, And A Radial, Diagonal Or Axial-Flow Fan Comprising An Inlet Nozzle") was filed by Ziehl Abegg on Apr 25, 2016. The application was issued on May 7, 2025.

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 |
|---|---|---|
| EBM PAPST MULFINGEN | Apr 28, 2021 | STAEGER & SPERLING PARTNERSCHAFTSGESELLSCHAFT MBB |
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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