Patent No. EP3118230 (titled "Vinylidene Fluoride Copolymer, Method For Producing Same, Gel Electrolyte And Nonaqueous Battery") was filed by Kureha on Feb 26, 2015. The application was issued on Sep 13, 2017.

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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