Patent No. EP3411440 (titled "Inorganic Particulate Material Suitable For Use In Polymeric Films") was filed by Imertech on Jan 31, 2017. The application was issued on Dec 30, 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 |
|---|---|---|
| SCHAEFER KALK | Sep 30, 2021 | MAI BESIER |
| IMI FABI | Sep 29, 2021 | FUCHS PATENTANWALTE PARTNERSCHAFT MBB |
| OMYA | Sep 27, 2021 | MAIWALD |
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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