Patent No. EP4090496 (titled "Apparatus And Method For Grinding Of Materials Such As Metal Comprising A Handling System Adapted To Automatically Exchange And Dress Tools") was filed by L Kellenberger on Jan 18, 2021. The application was issued on Mar 6, 2024.

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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