Patent No. EP3412742 (titled "Method For Manufacturing High-Temperature-Resistant Polyvinyl-Chloride Adhesive Tape") was filed by Hebei Yongle Tape on May 12, 2016. The application was issued on Sep 27, 2023.

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.