Patent No. EP3176807 (titled "X-Ray Tube Rotating Anode Target, X-Ray Tube, And X-Ray Examination Device") was filed by Kabushiki Kaisha Toshiba on Jul 29, 2015. The application was issued on Oct 21, 2020.

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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