Patent No. EP3405421 (titled "Device And Method For Changing A Reel And For Connecting A New Material Web To The End Of An Old Material Web") was filed by Windmller & Hlscher on Jan 18, 2017. The application was issued on Apr 26, 2023.

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.
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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