Patent No. EP3438295 (titled "Magnesium Oxide For Annealing Separators, And Grain-Oriented Magnetic Steel Sheet") was filed by Tateho Chemical Industries on Mar 16, 2017. The application was issued on Dec 16, 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 |
|---|---|---|
| DEAD SEA BROMINE | Sep 16, 2021 | HOYNG ROKH MONEGIER |
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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