Patent No. EP3245257 (titled "Surface-Treated Calcium Carbonate With Improved Stability In Environments With A Ph Of 4.5 To 7") was filed by Omya on Jan 13, 2016. The application was issued on Nov 30, 2022.

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 | Aug 13, 2020 | MAI BESIER |
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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