Patent No. EP4180217 (titled "Heat-Shrinkable Polyester-Based Film Roll") was filed by Toyobo on Jul 1, 2021. The application was issued on Sep 3, 2025.

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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