Patent No. EP2128289 (titled "Steel Sheet For Cans, Hot-Rolled Steel Sheet To Be Used As The Base Metal And Processes For Production Of Both") was filed by JFE Steel on Feb 22, 2008. The application was issued on Oct 23, 2019.

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.