Patent No. EP3233516 (titled "Security Element With Colour Shift Effect And Fluorescent Features And Method For Production And Use Of Same") was filed by Hueck Folien Gesellschaft on Nov 26, 2015. The application was issued on Jun 3, 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.
| Company | Opposition Date | Representative |
|---|---|---|
| OBERTHUR FIDUCIAIRE VHP SECURITY PAPER | Mar 2, 2021 | REGIMBEAU |
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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