Patent No. EP3470896 (titled "Light Guide Film, Forgery Prevention Structure, And Forgery Prevention Article") was filed by DAI Nippon Printing on Jun 13, 2017. The application was issued on Feb 17, 2021.

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 |
|---|---|---|
| ORELL FUSSLI | Nov 11, 2021 | E BLUM |
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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