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Patent No. EP3620242 (titled "Machine For The Working Of Tubes Provided With An Optical Sensor For Measuring The Forward Displacement Of The Tube Being Worked And/Or The Rotational Displacement Of The Same About The Longitudinal Axis Thereof") was filed by BLM on Sep 4, 2019. The application was issued on Apr 28, 2021.

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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